From f91a020b842ed05f26656f4957e2dbc87e8fe1c8 Mon Sep 17 00:00:00 2001
From: Fabien Potencier <fabien.potencier@gmail.com>
Date: Thu, 1 Jun 2017 10:56:34 -0700
Subject: [PATCH] Using FQ name for PHP_VERSION_ID

---
 .github/build-packages.php                    |  2 +-
 phpunit                                       |  2 +-
 .../Bridge/Twig/Extension/CodeExtension.php   |  2 +-
 .../Bridge/Twig/Tests/Node/DumpNodeTest.php   |  8 +++----
 .../Bridge/Twig/Tests/Node/FormThemeTest.php  |  4 ++--
 .../Node/SearchAndRenderBlockNodeTest.php     |  4 ++--
 .../Bridge/Twig/Tests/Node/TransNodeTest.php  |  8 +++----
 .../FrameworkBundle/Command/ServerCommand.php |  2 +-
 .../Templating/Helper/CodeHelper.php          |  2 +-
 .../Translation/PhpExtractor.php              |  2 +-
 .../ClassLoader/ClassCollectionLoader.php     |  2 +-
 .../ClassLoader/ClassMapGenerator.php         |  4 ++--
 .../Tests/ClassMapGeneratorTest.php           |  4 ++--
 .../Console/Descriptor/TextDescriptor.php     |  2 +-
 src/Symfony/Component/Debug/ErrorHandler.php  |  2 +-
 .../Component/Debug/ExceptionHandler.php      |  4 ++--
 .../Debug/Tests/DebugClassLoaderTest.php      |  6 ++---
 .../Component/ExpressionLanguage/Parser.php   |  2 +-
 .../Finder/Iterator/FilterIterator.php        |  2 +-
 .../Iterator/RecursiveDirectoryIterator.php   |  2 +-
 .../Form/Extension/Core/Type/DateType.php     |  2 +-
 .../Csrf/CsrfProvider/DefaultCsrfProvider.php |  2 +-
 .../Validator/ValidatorTypeGuesserTest.php    |  2 +-
 .../Component/HttpFoundation/JsonResponse.php | 10 ++++----
 .../Component/HttpFoundation/Request.php      |  2 +-
 .../Storage/Handler/NativeSessionHandler.php  |  2 +-
 .../Session/Storage/NativeSessionStorage.php  | 14 +++++------
 .../Session/Storage/Proxy/AbstractProxy.php   |  4 ++--
 .../HttpFoundation/Tests/RequestTest.php      |  2 +-
 .../Handler/NativeFileSessionHandlerTest.php  |  2 +-
 .../Handler/NativeSessionHandlerTest.php      |  2 +-
 .../Storage/NativeSessionStorageTest.php      |  4 ++--
 .../Storage/PhpBridgeSessionStorageTest.php   |  2 +-
 .../Storage/Proxy/AbstractProxyTest.php       |  8 +++----
 .../Storage/Proxy/SessionHandlerProxyTest.php |  2 +-
 .../DataCollector/DumpDataCollector.php       |  4 ++--
 .../Fragment/HIncludeFragmentRenderer.php     |  2 +-
 src/Symfony/Component/HttpKernel/Kernel.php   |  2 +-
 .../Controller/ControllerResolverTest.php     |  2 +-
 .../DataCollector/DumpDataCollectorTest.php   |  6 ++---
 .../Data/Bundle/Writer/JsonBundleWriter.php   |  2 +-
 .../Intl/DateFormatter/IntlDateFormatter.php  |  8 +++----
 .../Intl/NumberFormatter/NumberFormatter.php  |  4 ++--
 .../Bundle/Reader/IntlBundleReaderTest.php    |  4 ++--
 .../Bundle/Writer/JsonBundleWriterTest.php    |  2 +-
 .../Bundle/Writer/PhpBundleWriterTest.php     |  2 +-
 .../AbstractIntlDateFormatterTest.php         | 24 +++++++++----------
 .../AbstractNumberFormatterTest.php           |  6 ++---
 .../PropertyAccess/PropertyAccessor.php       |  4 ++--
 .../Routing/Loader/AnnotationFileLoader.php   |  2 +-
 .../NativeSessionTokenStorage.php             |  2 +-
 .../Session/SessionAuthenticationStrategy.php |  2 +-
 .../SessionAuthenticationStrategyTest.php     |  4 ++--
 .../Serializer/Encoder/JsonDecode.php         |  2 +-
 .../Component/Templating/PhpEngine.php        |  2 +-
 .../Tests/Dumper/JsonFileDumperTest.php       |  2 +-
 .../AbstractComparisonValidatorTestCase.php   |  4 ++--
 .../Constraints/IdenticalToValidatorTest.php  |  2 +-
 .../Tests/Constraints/RangeValidatorTest.php  |  6 ++---
 .../Component/VarDumper/Cloner/VarCloner.php  |  2 +-
 .../VarDumper/Tests/CliDumperTest.php         |  4 ++--
 .../VarDumper/Tests/HtmlDumperTest.php        |  2 +-
 .../Tests/Test/VarDumperTestTraitTest.php     |  2 +-
 .../Yaml/Exception/ParseException.php         |  2 +-
 .../Yaml/Tests/ParseExceptionTest.php         |  4 ++--
 65 files changed, 121 insertions(+), 121 deletions(-)

diff --git a/.github/build-packages.php b/.github/build-packages.php
index 02a2239732..56112b753a 100644
--- a/.github/build-packages.php
+++ b/.github/build-packages.php
@@ -11,7 +11,7 @@ array_shift($dirs);
 $mergeBase = trim(shell_exec(sprintf('git merge-base %s HEAD', array_shift($dirs))));
 
 $packages = array();
-$flags = PHP_VERSION_ID >= 50400 ? JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE : 0;
+$flags = \PHP_VERSION_ID >= 50400 ? JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE : 0;
 
 foreach ($dirs as $k => $dir) {
     if (!system("git diff --name-only $mergeBase -- $dir", $exitStatus)) {
diff --git a/phpunit b/phpunit
index 559660b1df..53e1a8dc31 100755
--- a/phpunit
+++ b/phpunit
@@ -7,7 +7,7 @@ if (!file_exists(__DIR__.'/vendor/symfony/phpunit-bridge/bin/simple-phpunit')) {
     echo "Unable to find the `simple-phpunit` script in `vendor/symfony/phpunit-bridge/bin/`.\nPlease run `composer update` before running this command.\n";
     exit(1);
 }
-if (PHP_VERSION_ID >= 70000 && !getenv('SYMFONY_PHPUNIT_VERSION')) {
+if (\PHP_VERSION_ID >= 70000 && !getenv('SYMFONY_PHPUNIT_VERSION')) {
     putenv('SYMFONY_PHPUNIT_VERSION=6.0');
 }
 putenv('SYMFONY_PHPUNIT_DIR='.__DIR__.'/.phpunit');
diff --git a/src/Symfony/Bridge/Twig/Extension/CodeExtension.php b/src/Symfony/Bridge/Twig/Extension/CodeExtension.php
index 59dbeec7e9..4b25d62198 100644
--- a/src/Symfony/Bridge/Twig/Extension/CodeExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/CodeExtension.php
@@ -174,7 +174,7 @@ class CodeExtension extends \Twig_Extension
         $text = "$text at line $line";
 
         if (false !== $link = $this->getFileLink($file, $line)) {
-            if (PHP_VERSION_ID >= 50400) {
+            if (\PHP_VERSION_ID >= 50400) {
                 $flags = ENT_QUOTES | ENT_SUBSTITUTE;
             } else {
                 $flags = ENT_QUOTES;
diff --git a/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php b/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php
index 93c8433c28..e38d9c7282 100644
--- a/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php
@@ -81,9 +81,9 @@ if ($this->env->isDebug()) {
 }
 
 EOTXT;
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             $expected = preg_replace('/%(.*?)%/', '($context["$1"] ?? null)', $expected);
-        } elseif (PHP_VERSION_ID >= 50400) {
+        } elseif (\PHP_VERSION_ID >= 50400) {
             $expected = preg_replace('/%(.*?)%/', '(isset($context["$1"]) ? $context["$1"] : null)', $expected);
         } else {
             $expected = preg_replace('/%(.*?)%/', '$this->getContext($context, "$1")', $expected);
@@ -114,9 +114,9 @@ if ($this->env->isDebug()) {
 
 EOTXT;
 
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             $expected = preg_replace('/%(.*?)%/', '($context["$1"] ?? null)', $expected);
-        } elseif (PHP_VERSION_ID >= 50400) {
+        } elseif (\PHP_VERSION_ID >= 50400) {
             $expected = preg_replace('/%(.*?)%/', '(isset($context["$1"]) ? $context["$1"] : null)', $expected);
         } else {
             $expected = preg_replace('/%(.*?)%/', '$this->getContext($context, "$1")', $expected);
diff --git a/src/Symfony/Bridge/Twig/Tests/Node/FormThemeTest.php b/src/Symfony/Bridge/Twig/Tests/Node/FormThemeTest.php
index 4202355594..923c20ff35 100644
--- a/src/Symfony/Bridge/Twig/Tests/Node/FormThemeTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Node/FormThemeTest.php
@@ -67,11 +67,11 @@ class FormThemeTest extends TestCase
 
     protected function getVariableGetter($name)
     {
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             return sprintf('($context["%s"] ?? null)', $name, $name);
         }
 
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             return sprintf('(isset($context["%s"]) ? $context["%s"] : null)', $name, $name);
         }
 
diff --git a/src/Symfony/Bridge/Twig/Tests/Node/SearchAndRenderBlockNodeTest.php b/src/Symfony/Bridge/Twig/Tests/Node/SearchAndRenderBlockNodeTest.php
index 69b987e832..e29f66ea3c 100644
--- a/src/Symfony/Bridge/Twig/Tests/Node/SearchAndRenderBlockNodeTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Node/SearchAndRenderBlockNodeTest.php
@@ -264,11 +264,11 @@ class SearchAndRenderBlockNodeTest extends TestCase
 
     protected function getVariableGetter($name)
     {
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             return sprintf('($context["%s"] ?? null)', $name, $name);
         }
 
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             return sprintf('(isset($context["%s"]) ? $context["%s"] : null)', $name, $name);
         }
 
diff --git a/src/Symfony/Bridge/Twig/Tests/Node/TransNodeTest.php b/src/Symfony/Bridge/Twig/Tests/Node/TransNodeTest.php
index 683d47af27..aabd813e5c 100644
--- a/src/Symfony/Bridge/Twig/Tests/Node/TransNodeTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Node/TransNodeTest.php
@@ -40,11 +40,11 @@ class TransNodeTest extends TestCase
 
     protected function getVariableGetterWithoutStrictCheck($name)
     {
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             return sprintf('($context["%s"] ?? null)', $name, $name);
         }
 
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             return sprintf('(isset($context["%s"]) ? $context["%s"] : null)', $name, $name);
         }
 
@@ -57,11 +57,11 @@ class TransNodeTest extends TestCase
             return sprintf('(isset($context["%s"]) || array_key_exists("%s", $context) ? $context["%s"] : (function () { throw new Twig_Error_Runtime(\'Variable "%s" does not exist.\', 0, $this->getSourceContext()); })())', $name, $name, $name, $name);
         }
 
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             return sprintf('($context["%s"] ?? $this->getContext($context, "%s"))', $name, $name, $name);
         }
 
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             return sprintf('(isset($context["%s"]) ? $context["%s"] : $this->getContext($context, "%s"))', $name, $name, $name);
         }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ServerCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ServerCommand.php
index 3e1c324f00..c5f9ee0ecd 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/ServerCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/ServerCommand.php
@@ -23,7 +23,7 @@ abstract class ServerCommand extends ContainerAwareCommand
      */
     public function isEnabled()
     {
-        if (PHP_VERSION_ID < 50400 || defined('HHVM_VERSION')) {
+        if (\PHP_VERSION_ID < 50400 || defined('HHVM_VERSION')) {
             return false;
         }
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/CodeHelper.php b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/CodeHelper.php
index cdf19e3ada..06071e51b2 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/CodeHelper.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Templating/Helper/CodeHelper.php
@@ -154,7 +154,7 @@ class CodeHelper extends Helper
      */
     public function formatFile($file, $line, $text = null)
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $flags = ENT_QUOTES | ENT_SUBSTITUTE;
         } else {
             $flags = ENT_QUOTES;
diff --git a/src/Symfony/Bundle/FrameworkBundle/Translation/PhpExtractor.php b/src/Symfony/Bundle/FrameworkBundle/Translation/PhpExtractor.php
index 97c94fdd14..70658f6723 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Translation/PhpExtractor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Translation/PhpExtractor.php
@@ -85,7 +85,7 @@ class PhpExtractor extends AbstractFileExtractor implements ExtractorInterface
         foreach ($files as $file) {
             $this->parseTokens(token_get_all(file_get_contents($file)), $catalog);
 
-            if (PHP_VERSION_ID >= 70000) {
+            if (\PHP_VERSION_ID >= 70000) {
                 // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
                 gc_mem_caches();
             }
diff --git a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
index 6f88286de0..cd3c433ed2 100644
--- a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
+++ b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
@@ -232,7 +232,7 @@ REGEX;
 
         $output .= self::compressCode($rawChunk);
 
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
             unset($tokens, $rawChunk);
             gc_mem_caches();
diff --git a/src/Symfony/Component/ClassLoader/ClassMapGenerator.php b/src/Symfony/Component/ClassLoader/ClassMapGenerator.php
index 2976eb81c0..a35c90ca10 100644
--- a/src/Symfony/Component/ClassLoader/ClassMapGenerator.php
+++ b/src/Symfony/Component/ClassLoader/ClassMapGenerator.php
@@ -12,7 +12,7 @@
 namespace Symfony\Component\ClassLoader;
 
 if (!defined('SYMFONY_TRAIT')) {
-    if (PHP_VERSION_ID >= 50400) {
+    if (\PHP_VERSION_ID >= 50400) {
         define('SYMFONY_TRAIT', T_TRAIT);
     } else {
         define('SYMFONY_TRAIT', 0);
@@ -72,7 +72,7 @@ class ClassMapGenerator
 
             $classes = self::findClasses($path);
 
-            if (PHP_VERSION_ID >= 70000) {
+            if (\PHP_VERSION_ID >= 70000) {
                 // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
                 gc_mem_caches();
             }
diff --git a/src/Symfony/Component/ClassLoader/Tests/ClassMapGeneratorTest.php b/src/Symfony/Component/ClassLoader/Tests/ClassMapGeneratorTest.php
index db7fb962ce..c12182497a 100644
--- a/src/Symfony/Component/ClassLoader/Tests/ClassMapGeneratorTest.php
+++ b/src/Symfony/Component/ClassLoader/Tests/ClassMapGeneratorTest.php
@@ -108,7 +108,7 @@ class ClassMapGeneratorTest extends TestCase
             )),
         );
 
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $data[] = array(__DIR__.'/Fixtures/php5.4', array(
                 'TFoo' => __DIR__.'/Fixtures/php5.4/traits.php',
                 'CFoo' => __DIR__.'/Fixtures/php5.4/traits.php',
@@ -119,7 +119,7 @@ class ClassMapGeneratorTest extends TestCase
             ));
         }
 
-        if (PHP_VERSION_ID >= 50500) {
+        if (\PHP_VERSION_ID >= 50500) {
             $data[] = array(__DIR__.'/Fixtures/php5.5', array(
                 'ClassCons\\Foo' => __DIR__.'/Fixtures/php5.5/class_cons.php',
             ));
diff --git a/src/Symfony/Component/Console/Descriptor/TextDescriptor.php b/src/Symfony/Component/Console/Descriptor/TextDescriptor.php
index b49b64d5ac..c0dd4830c3 100644
--- a/src/Symfony/Component/Console/Descriptor/TextDescriptor.php
+++ b/src/Symfony/Component/Console/Descriptor/TextDescriptor.php
@@ -247,7 +247,7 @@ class TextDescriptor extends Descriptor
             }
         }
 
-        if (PHP_VERSION_ID < 50400) {
+        if (\PHP_VERSION_ID < 50400) {
             return str_replace(array('\/', '\\\\'), array('/', '\\'), json_encode($default));
         }
 
diff --git a/src/Symfony/Component/Debug/ErrorHandler.php b/src/Symfony/Component/Debug/ErrorHandler.php
index 46bcc33f67..7624d1213f 100644
--- a/src/Symfony/Component/Debug/ErrorHandler.php
+++ b/src/Symfony/Component/Debug/ErrorHandler.php
@@ -404,7 +404,7 @@ class ErrorHandler
                 $throw = new \ErrorException($this->levels[$type].': '.$message, 0, $type, $file, $line);
             }
 
-            if (PHP_VERSION_ID <= 50407 && (PHP_VERSION_ID >= 50400 || PHP_VERSION_ID <= 50317)) {
+            if (\PHP_VERSION_ID <= 50407 && (\PHP_VERSION_ID >= 50400 || \PHP_VERSION_ID <= 50317)) {
                 // Exceptions thrown from error handlers are sometimes not caught by the exception
                 // handler and shutdown handlers are bypassed before 5.4.8/5.3.18.
                 // We temporarily re-enable display_errors to prevent any blank page related to this bug.
diff --git a/src/Symfony/Component/Debug/ExceptionHandler.php b/src/Symfony/Component/Debug/ExceptionHandler.php
index 23929b3946..e0d7a0580c 100644
--- a/src/Symfony/Component/Debug/ExceptionHandler.php
+++ b/src/Symfony/Component/Debug/ExceptionHandler.php
@@ -434,7 +434,7 @@ EOF;
     {
         @trigger_error('The '.__METHOD__.' method is deprecated since version 2.7 and will be removed in 3.0.', E_USER_DEPRECATED);
 
-        return htmlspecialchars($str, ENT_QUOTES | (PHP_VERSION_ID >= 50400 ? ENT_SUBSTITUTE : 0), 'UTF-8');
+        return htmlspecialchars($str, ENT_QUOTES | (\PHP_VERSION_ID >= 50400 ? ENT_SUBSTITUTE : 0), 'UTF-8');
     }
 
     /**
@@ -442,7 +442,7 @@ EOF;
      */
     private function escapeHtml($str)
     {
-        return htmlspecialchars($str, ENT_QUOTES | (PHP_VERSION_ID >= 50400 ? ENT_SUBSTITUTE : 0), $this->charset);
+        return htmlspecialchars($str, ENT_QUOTES | (\PHP_VERSION_ID >= 50400 ? ENT_SUBSTITUTE : 0), $this->charset);
     }
 
     /**
diff --git a/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php b/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php
index 8d0a027346..133ca28e54 100644
--- a/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php
+++ b/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php
@@ -61,7 +61,7 @@ class DebugClassLoaderTest extends TestCase
 
     public function testUnsilencing()
     {
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             $this->markTestSkipped('PHP7 throws exceptions, unsilencing is not required anymore.');
         }
         if (defined('HHVM_VERSION')) {
@@ -111,7 +111,7 @@ class DebugClassLoaderTest extends TestCase
             restore_error_handler();
             restore_exception_handler();
             $this->assertStringStartsWith(__FILE__, $exception->getFile());
-            if (PHP_VERSION_ID < 70000) {
+            if (\PHP_VERSION_ID < 70000) {
                 $this->assertRegExp('/^Runtime Notice: Declaration/', $exception->getMessage());
                 $this->assertEquals(E_STRICT, $exception->getSeverity());
             } else {
@@ -227,7 +227,7 @@ class DebugClassLoaderTest extends TestCase
 
     public function testReservedForPhp7()
     {
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             $this->markTestSkipped('PHP7 already prevents using reserved names.');
         }
 
diff --git a/src/Symfony/Component/ExpressionLanguage/Parser.php b/src/Symfony/Component/ExpressionLanguage/Parser.php
index 6f90451522..d847dfa4b0 100644
--- a/src/Symfony/Component/ExpressionLanguage/Parser.php
+++ b/src/Symfony/Component/ExpressionLanguage/Parser.php
@@ -344,7 +344,7 @@ class Parser
 
                 $node = new Node\GetAttrNode($node, $arg, $arguments, $type);
             } elseif ('[' === $token->value) {
-                if ($node instanceof Node\GetAttrNode && Node\GetAttrNode::METHOD_CALL === $node->attributes['type'] && PHP_VERSION_ID < 50400) {
+                if ($node instanceof Node\GetAttrNode && Node\GetAttrNode::METHOD_CALL === $node->attributes['type'] && \PHP_VERSION_ID < 50400) {
                     throw new SyntaxError('Array calls on a method call is only supported on PHP 5.4+', $token->cursor, $this->stream->getExpression());
                 }
 
diff --git a/src/Symfony/Component/Finder/Iterator/FilterIterator.php b/src/Symfony/Component/Finder/Iterator/FilterIterator.php
index 3c3c3fbec0..acb98361c9 100644
--- a/src/Symfony/Component/Finder/Iterator/FilterIterator.php
+++ b/src/Symfony/Component/Finder/Iterator/FilterIterator.php
@@ -29,7 +29,7 @@ abstract class FilterIterator extends \FilterIterator
      */
     public function rewind()
     {
-        if (PHP_VERSION_ID > 50607 || (PHP_VERSION_ID > 50523 && PHP_VERSION_ID < 50600)) {
+        if (\PHP_VERSION_ID > 50607 || (\PHP_VERSION_ID > 50523 && \PHP_VERSION_ID < 50600)) {
             parent::rewind();
 
             return;
diff --git a/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php b/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
index 1df2f5014f..c87096fc87 100644
--- a/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
+++ b/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
@@ -119,7 +119,7 @@ class RecursiveDirectoryIterator extends \RecursiveDirectoryIterator
         }
 
         // @see https://bugs.php.net/68557
-        if (PHP_VERSION_ID < 50523 || PHP_VERSION_ID >= 50600 && PHP_VERSION_ID < 50607) {
+        if (\PHP_VERSION_ID < 50523 || \PHP_VERSION_ID >= 50600 && \PHP_VERSION_ID < 50607) {
             parent::next();
         }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/DateType.php b/src/Symfony/Component/Form/Extension/Core/Type/DateType.php
index fdb7ff59e7..d77cdc8e70 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/DateType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/DateType.php
@@ -272,7 +272,7 @@ class DateType extends AbstractType
         $timezone = $formatter->getTimezoneId();
         $formattedTimestamps = array();
 
-        if ($setTimeZone = PHP_VERSION_ID >= 50500 || method_exists($formatter, 'setTimeZone')) {
+        if ($setTimeZone = \PHP_VERSION_ID >= 50500 || method_exists($formatter, 'setTimeZone')) {
             $formatter->setTimeZone('UTC');
         } else {
             $formatter->setTimeZoneId('UTC');
diff --git a/src/Symfony/Component/Form/Extension/Csrf/CsrfProvider/DefaultCsrfProvider.php b/src/Symfony/Component/Form/Extension/Csrf/CsrfProvider/DefaultCsrfProvider.php
index 7e25a122c6..387f4ccf35 100644
--- a/src/Symfony/Component/Form/Extension/Csrf/CsrfProvider/DefaultCsrfProvider.php
+++ b/src/Symfony/Component/Form/Extension/Csrf/CsrfProvider/DefaultCsrfProvider.php
@@ -85,7 +85,7 @@ class DefaultCsrfProvider implements CsrfProviderInterface
      */
     protected function getSessionId()
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             if (PHP_SESSION_NONE === session_status()) {
                 session_start();
             }
diff --git a/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorTypeGuesserTest.php b/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorTypeGuesserTest.php
index 6ddac337af..2f2d5676a9 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorTypeGuesserTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Validator/ValidatorTypeGuesserTest.php
@@ -90,7 +90,7 @@ class ValidatorTypeGuesserTest extends TestCase
      */
     public function testLegacyGuessRequired()
     {
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             $this->markTestSkipped('Cannot use a class called True on PHP 7 or higher.');
         }
         $true = 'Symfony\Component\Validator\Constraints\True';
diff --git a/src/Symfony/Component/HttpFoundation/JsonResponse.php b/src/Symfony/Component/HttpFoundation/JsonResponse.php
index b20e2e28ba..c6e0ba6541 100644
--- a/src/Symfony/Component/HttpFoundation/JsonResponse.php
+++ b/src/Symfony/Component/HttpFoundation/JsonResponse.php
@@ -121,7 +121,7 @@ class JsonResponse extends Response
             $data = json_encode($data, $this->encodingOptions);
         } else {
             try {
-                if (PHP_VERSION_ID < 50400) {
+                if (\PHP_VERSION_ID < 50400) {
                     // PHP 5.3 triggers annoying warnings for some
                     // types that can't be serialized as JSON (INF, resources, etc.)
                     // but doesn't provide the JsonSerializable interface.
@@ -131,7 +131,7 @@ class JsonResponse extends Response
                     // PHP 5.4 and up wrap exceptions thrown by JsonSerializable
                     // objects in a new exception that needs to be removed.
                     // Fortunately, PHP 5.5 and up do not trigger any warning anymore.
-                    if (PHP_VERSION_ID < 50500) {
+                    if (\PHP_VERSION_ID < 50500) {
                         // Clear json_last_error()
                         json_encode(null);
                         $errorHandler = set_error_handler('var_dump');
@@ -146,14 +146,14 @@ class JsonResponse extends Response
                     $data = json_encode($data, $this->encodingOptions);
                 }
 
-                if (PHP_VERSION_ID < 50500) {
+                if (\PHP_VERSION_ID < 50500) {
                     restore_error_handler();
                 }
             } catch (\Exception $e) {
-                if (PHP_VERSION_ID < 50500) {
+                if (\PHP_VERSION_ID < 50500) {
                     restore_error_handler();
                 }
-                if (PHP_VERSION_ID >= 50400 && 'Exception' === get_class($e) && 0 === strpos($e->getMessage(), 'Failed calling ')) {
+                if (\PHP_VERSION_ID >= 50400 && 'Exception' === get_class($e) && 0 === strpos($e->getMessage(), 'Failed calling ')) {
                     throw $e->getPrevious() ?: $e;
                 }
                 throw $e;
diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index 0291f9f671..0c11adab6a 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -1502,7 +1502,7 @@ class Request
     public function getContent($asResource = false)
     {
         $currentContentIsResource = is_resource($this->content);
-        if (PHP_VERSION_ID < 50600 && false === $this->content) {
+        if (\PHP_VERSION_ID < 50600 && false === $this->content) {
             throw new \LogicException('getContent() can only be called once when using the resource return type and PHP below 5.6.');
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/NativeSessionHandler.php b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/NativeSessionHandler.php
index 95d5cdbf56..03acbd94ee 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/NativeSessionHandler.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/Handler/NativeSessionHandler.php
@@ -13,7 +13,7 @@ namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
 
 // Adds SessionHandler functionality if available.
 // @see http://php.net/sessionhandler
-if (PHP_VERSION_ID >= 50400) {
+if (\PHP_VERSION_ID >= 50400) {
     class NativeSessionHandler extends \SessionHandler
     {
     }
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php b/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php
index 4deb58eca2..36a20550b0 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php
@@ -102,7 +102,7 @@ class NativeSessionStorage implements SessionStorageInterface
         session_cache_limiter(''); // disable by default because it's managed by HeaderBag (if used)
         ini_set('session.use_cookies', 1);
 
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             session_register_shutdown();
         } else {
             register_shutdown_function('session_write_close');
@@ -132,11 +132,11 @@ class NativeSessionStorage implements SessionStorageInterface
             return true;
         }
 
-        if (PHP_VERSION_ID >= 50400 && \PHP_SESSION_ACTIVE === session_status()) {
+        if (\PHP_VERSION_ID >= 50400 && \PHP_SESSION_ACTIVE === session_status()) {
             throw new \RuntimeException('Failed to start the session: already started by PHP.');
         }
 
-        if (PHP_VERSION_ID < 50400 && !$this->closed && isset($_SESSION) && session_id()) {
+        if (\PHP_VERSION_ID < 50400 && !$this->closed && isset($_SESSION) && session_id()) {
             // not 100% fool-proof, but is the most reliable way to determine if a session is active in PHP 5.3
             throw new \RuntimeException('Failed to start the session: already started by PHP ($_SESSION is set).');
         }
@@ -197,12 +197,12 @@ class NativeSessionStorage implements SessionStorageInterface
     public function regenerate($destroy = false, $lifetime = null)
     {
         // Cannot regenerate the session ID for non-active sessions.
-        if (PHP_VERSION_ID >= 50400 && \PHP_SESSION_ACTIVE !== session_status()) {
+        if (\PHP_VERSION_ID >= 50400 && \PHP_SESSION_ACTIVE !== session_status()) {
             return false;
         }
 
         // Check if session ID exists in PHP 5.3
-        if (PHP_VERSION_ID < 50400 && '' === session_id()) {
+        if (\PHP_VERSION_ID < 50400 && '' === session_id()) {
             return false;
         }
 
@@ -384,13 +384,13 @@ class NativeSessionStorage implements SessionStorageInterface
         if (!$saveHandler instanceof AbstractProxy && $saveHandler instanceof \SessionHandlerInterface) {
             $saveHandler = new SessionHandlerProxy($saveHandler);
         } elseif (!$saveHandler instanceof AbstractProxy) {
-            $saveHandler = PHP_VERSION_ID >= 50400 ?
+            $saveHandler = \PHP_VERSION_ID >= 50400 ?
                 new SessionHandlerProxy(new \SessionHandler()) : new NativeProxy();
         }
         $this->saveHandler = $saveHandler;
 
         if ($this->saveHandler instanceof \SessionHandlerInterface) {
-            if (PHP_VERSION_ID >= 50400) {
+            if (\PHP_VERSION_ID >= 50400) {
                 session_set_save_handler($this->saveHandler, false);
             } else {
                 session_set_save_handler(
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/AbstractProxy.php b/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/AbstractProxy.php
index 463677b55a..405e60b2fd 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/AbstractProxy.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/AbstractProxy.php
@@ -72,7 +72,7 @@ abstract class AbstractProxy
      */
     public function isActive()
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             return $this->active = \PHP_SESSION_ACTIVE === session_status();
         }
 
@@ -93,7 +93,7 @@ abstract class AbstractProxy
      */
     public function setActive($flag)
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             throw new \LogicException('This method is disabled in PHP 5.4.0+');
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php b/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
index 6f9d76b483..bb7a3f4800 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
@@ -1029,7 +1029,7 @@ class RequestTest extends TestCase
      */
     public function testGetContentCantBeCalledTwiceWithResources($first, $second)
     {
-        if (PHP_VERSION_ID >= 50600) {
+        if (\PHP_VERSION_ID >= 50600) {
             $this->markTestSkipped('PHP >= 5.6 allows to open php://input several times.');
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NativeFileSessionHandlerTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NativeFileSessionHandlerTest.php
index 947502f7b1..67336f68dc 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NativeFileSessionHandlerTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NativeFileSessionHandlerTest.php
@@ -29,7 +29,7 @@ class NativeFileSessionHandlerTest extends TestCase
     {
         $storage = new NativeSessionStorage(array('name' => 'TESTING'), new NativeFileSessionHandler(sys_get_temp_dir()));
 
-        if (PHP_VERSION_ID < 50400) {
+        if (\PHP_VERSION_ID < 50400) {
             $this->assertEquals('files', $storage->getSaveHandler()->getSaveHandlerName());
             $this->assertEquals('files', ini_get('session.save_handler'));
         } else {
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NativeSessionHandlerTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NativeSessionHandlerTest.php
index bd335b3b4c..021d8c0f9e 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NativeSessionHandlerTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/NativeSessionHandlerTest.php
@@ -30,7 +30,7 @@ class NativeSessionHandlerTest extends TestCase
 
         // note for PHPUnit optimisers - the use of assertTrue/False
         // here is deliberate since the tests do not require the classes to exist - drak
-        if (PHP_VERSION_ID < 50400) {
+        if (\PHP_VERSION_ID < 50400) {
             $this->assertFalse($handler instanceof \SessionHandler);
             $this->assertTrue($handler instanceof NativeSessionHandler);
         } else {
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/NativeSessionStorageTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/NativeSessionStorageTest.php
index 4da9a1bc51..20f9ca060b 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/NativeSessionStorageTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/NativeSessionStorageTest.php
@@ -196,7 +196,7 @@ class NativeSessionStorageTest extends TestCase
 
     public function testSetSaveHandler53()
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $this->markTestSkipped('Test skipped, for PHP 5.3 only.');
         }
 
@@ -249,7 +249,7 @@ class NativeSessionStorageTest extends TestCase
 
         session_start();
         $this->assertTrue(isset($_SESSION));
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             // this only works in PHP >= 5.4 where session_status is available
             $this->assertTrue($storage->getSaveHandler()->isActive());
         }
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/PhpBridgeSessionStorageTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/PhpBridgeSessionStorageTest.php
index 99491ce86a..5cfb328d30 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/PhpBridgeSessionStorageTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/PhpBridgeSessionStorageTest.php
@@ -62,7 +62,7 @@ class PhpBridgeSessionStorageTest extends TestCase
 
     public function testPhpSession53()
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $this->markTestSkipped('Test skipped, for PHP 5.3 only.');
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Proxy/AbstractProxyTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Proxy/AbstractProxyTest.php
index efd8d80d35..f21bcc9632 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Proxy/AbstractProxyTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Proxy/AbstractProxyTest.php
@@ -88,7 +88,7 @@ class AbstractProxyTest extends TestCase
 
     public function testIsActivePhp53()
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $this->markTestSkipped('Test skipped, for PHP 5.3 only.');
         }
 
@@ -109,7 +109,7 @@ class AbstractProxyTest extends TestCase
 
     public function testSetActivePhp53()
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $this->markTestSkipped('Test skipped, for PHP 5.3 only.');
         }
 
@@ -147,7 +147,7 @@ class AbstractProxyTest extends TestCase
      */
     public function testNameExceptionPhp53()
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $this->markTestSkipped('Test skipped, for PHP 5.3 only.');
         }
 
@@ -184,7 +184,7 @@ class AbstractProxyTest extends TestCase
      */
     public function testIdExceptionPhp53()
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $this->markTestSkipped('Test skipped, for PHP 5.3 only.');
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Proxy/SessionHandlerProxyTest.php b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Proxy/SessionHandlerProxyTest.php
index 243f850b5e..df277ac5a8 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Proxy/SessionHandlerProxyTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Proxy/SessionHandlerProxyTest.php
@@ -54,7 +54,7 @@ class SessionHandlerProxyTest extends TestCase
 
         $this->assertFalse($this->proxy->isActive());
         $this->proxy->open('name', 'id');
-        if (PHP_VERSION_ID < 50400) {
+        if (\PHP_VERSION_ID < 50400) {
             $this->assertTrue($this->proxy->isActive());
         } else {
             $this->assertFalse($this->proxy->isActive());
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
index 78fc74f2d3..9448ad180b 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
@@ -71,7 +71,7 @@ class DumpDataCollector extends DataCollector implements DataDumperInterface
         }
 
         $trace = DEBUG_BACKTRACE_PROVIDE_OBJECT | DEBUG_BACKTRACE_IGNORE_ARGS;
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $trace = debug_backtrace($trace, 7);
         } else {
             $trace = debug_backtrace($trace);
@@ -263,7 +263,7 @@ class DumpDataCollector extends DataCollector implements DataDumperInterface
 
     private function doDump($data, $name, $file, $line)
     {
-        if (PHP_VERSION_ID >= 50400 && $this->dumper instanceof CliDumper) {
+        if (\PHP_VERSION_ID >= 50400 && $this->dumper instanceof CliDumper) {
             $contextDumper = function ($name, $file, $line, $fileLinkFormat) {
                 if ($this instanceof HtmlDumper) {
                     if ('' !== $file) {
diff --git a/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php b/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php
index 27051cfb77..09f84ec3b8 100644
--- a/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php
+++ b/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php
@@ -107,7 +107,7 @@ class HIncludeFragmentRenderer extends RoutableFragmentRenderer
         }
         $renderedAttributes = '';
         if (count($attributes) > 0) {
-            if (PHP_VERSION_ID >= 50400) {
+            if (\PHP_VERSION_ID >= 50400) {
                 $flags = ENT_QUOTES | ENT_SUBSTITUTE;
             } else {
                 $flags = ENT_QUOTES;
diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index 4bbd67b1e5..d20b6e2a16 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -753,7 +753,7 @@ abstract class Kernel implements KernelInterface, TerminableInterface
 
         $output .= $rawChunk;
 
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
             unset($tokens, $rawChunk);
             gc_mem_caches();
diff --git a/src/Symfony/Component/HttpKernel/Tests/Controller/ControllerResolverTest.php b/src/Symfony/Component/HttpKernel/Tests/Controller/ControllerResolverTest.php
index 046b71ac01..58ca07fc53 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Controller/ControllerResolverTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Controller/ControllerResolverTest.php
@@ -184,7 +184,7 @@ class ControllerResolverTest extends TestCase
         $request->attributes->set('foobar', 'foobar');
         $controller = array(new self(), 'controllerMethod3');
 
-        if (PHP_VERSION_ID === 50316) {
+        if (\PHP_VERSION_ID === 50316) {
             $this->markTestSkipped('PHP 5.3.16 has a major bug in the Reflection sub-system');
         } else {
             try {
diff --git a/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php b/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php
index 48b46efad0..91f4b2e6f2 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php
@@ -68,7 +68,7 @@ class DumpDataCollectorTest extends TestCase
         $collector->collect(new Request(), new Response());
         $output = ob_get_clean();
 
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $this->assertSame("DumpDataCollectorTest.php on line {$line}:\n123\n", $output);
         } else {
             $this->assertSame("\"DumpDataCollectorTest.php on line {$line}:\"\n123\n", $output);
@@ -86,7 +86,7 @@ class DumpDataCollectorTest extends TestCase
         $collector->dump($data);
         $line = __LINE__ - 1;
         $file = __FILE__;
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $xOutput = <<<EOTXT
 <pre class=sf-dump id=sf-dump data-indent-pad="  "><a href="test://{$file}:{$line}" title="{$file}"><span class=sf-dump-meta>DumpDataCollectorTest.php</span></a> on line <span class=sf-dump-meta>{$line}</span>:
 <span class=sf-dump-num>123</span>
@@ -124,7 +124,7 @@ EOTXT;
 
         ob_start();
         $collector->__destruct();
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $this->assertSame("DumpDataCollectorTest.php on line {$line}:\n456\n", ob_get_clean());
         } else {
             $this->assertSame("\"DumpDataCollectorTest.php on line {$line}:\"\n456\n", ob_get_clean());
diff --git a/src/Symfony/Component/Intl/Data/Bundle/Writer/JsonBundleWriter.php b/src/Symfony/Component/Intl/Data/Bundle/Writer/JsonBundleWriter.php
index 6a79340c69..1a5f07f0a1 100644
--- a/src/Symfony/Component/Intl/Data/Bundle/Writer/JsonBundleWriter.php
+++ b/src/Symfony/Component/Intl/Data/Bundle/Writer/JsonBundleWriter.php
@@ -35,7 +35,7 @@ class JsonBundleWriter implements BundleWriterInterface
             }
         });
 
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             // Use JSON_PRETTY_PRINT so that we can see what changed in Git diffs
             file_put_contents(
                 $path.'/'.$locale.'.json',
diff --git a/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php b/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php
index 908afc8ace..438b4d73e9 100644
--- a/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php
+++ b/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php
@@ -209,7 +209,7 @@ class IntlDateFormatter
         $argumentError = null;
         if (!is_int($timestamp) && !$timestamp instanceof \DateTime) {
             $argumentError = 'datefmt_format: takes either an array or an integer timestamp value or a DateTime object';
-            if (PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+            if (\PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
                 $argumentError = sprintf('datefmt_format: string \'%s\' is not numeric, which would be required for it to be a valid date', $timestamp);
             }
         }
@@ -371,7 +371,7 @@ class IntlDateFormatter
         }
 
         // In PHP 5.5 default timezone depends on `date_default_timezone_get()` method
-        if (PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+        if (\PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
             return date_default_timezone_get();
         }
     }
@@ -536,7 +536,7 @@ class IntlDateFormatter
     {
         if (null === $timeZoneId) {
             // In PHP 5.5 if $timeZoneId is null it fallbacks to `date_default_timezone_get()` method
-            if (PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+            if (\PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
                 $timeZoneId = date_default_timezone_get();
             } else {
                 // TODO: changes were made to ext/intl in PHP 5.4.4 release that need to be investigated since it will
@@ -567,7 +567,7 @@ class IntlDateFormatter
                 $timeZone = $this->getTimeZoneId();
             }
         } catch (\Exception $e) {
-            if (PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+            if (\PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
                 $timeZoneId = $timeZone = $this->getTimeZoneId();
             } else {
                 $timeZoneId = 'UTC';
diff --git a/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php b/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
index f93147c593..50ee30a217 100644
--- a/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
+++ b/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
@@ -854,7 +854,7 @@ class NumberFormatter
             // The negative PHP_INT_MAX was being converted to float
             if (
                 $value == -self::$int32Max - 1 &&
-                ((PHP_VERSION_ID < 50400 && PHP_VERSION_ID >= 50314) || PHP_VERSION_ID >= 50404 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone')))
+                ((\PHP_VERSION_ID < 50400 && \PHP_VERSION_ID >= 50314) || \PHP_VERSION_ID >= 50404 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone')))
             ) {
                 return (int) $value;
             }
@@ -867,7 +867,7 @@ class NumberFormatter
             // A 32 bit integer was being generated instead of a 64 bit integer
             if (
                   ($value > self::$int32Max || $value < -self::$int32Max - 1) &&
-                  (PHP_VERSION_ID < 50314 || (PHP_VERSION_ID >= 50400 && PHP_VERSION_ID < 50404)) &&
+                  (\PHP_VERSION_ID < 50314 || (\PHP_VERSION_ID >= 50400 && \PHP_VERSION_ID < 50404)) &&
                   !(extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))
             ) {
                 $value = (-2147483648 - ($value % -2147483648)) * ($value / abs($value));
diff --git a/src/Symfony/Component/Intl/Tests/Data/Bundle/Reader/IntlBundleReaderTest.php b/src/Symfony/Component/Intl/Tests/Data/Bundle/Reader/IntlBundleReaderTest.php
index 88e6974bf2..76543d3f0a 100644
--- a/src/Symfony/Component/Intl/Tests/Data/Bundle/Reader/IntlBundleReaderTest.php
+++ b/src/Symfony/Component/Intl/Tests/Data/Bundle/Reader/IntlBundleReaderTest.php
@@ -51,7 +51,7 @@ class IntlBundleReaderTest extends TestCase
 
     public function testReadDoesNotFollowFallback()
     {
-        if (PHP_VERSION_ID < 50307 || PHP_VERSION_ID === 50400) {
+        if (\PHP_VERSION_ID < 50307 || \PHP_VERSION_ID === 50400) {
             $this->markTestSkipped('ResourceBundle handles disabling fallback properly only as of PHP 5.3.7 and 5.4.1.');
         }
 
@@ -71,7 +71,7 @@ class IntlBundleReaderTest extends TestCase
 
     public function testReadDoesNotFollowFallbackAlias()
     {
-        if (PHP_VERSION_ID < 50307 || PHP_VERSION_ID === 50400) {
+        if (\PHP_VERSION_ID < 50307 || \PHP_VERSION_ID === 50400) {
             $this->markTestSkipped('ResourceBundle handles disabling fallback properly only as of PHP 5.3.7 and 5.4.1.');
         }
 
diff --git a/src/Symfony/Component/Intl/Tests/Data/Bundle/Writer/JsonBundleWriterTest.php b/src/Symfony/Component/Intl/Tests/Data/Bundle/Writer/JsonBundleWriterTest.php
index b8610334d5..d18968c9c9 100644
--- a/src/Symfony/Component/Intl/Tests/Data/Bundle/Writer/JsonBundleWriterTest.php
+++ b/src/Symfony/Component/Intl/Tests/Data/Bundle/Writer/JsonBundleWriterTest.php
@@ -44,7 +44,7 @@ class JsonBundleWriterTest extends TestCase
 
     protected function tearDown()
     {
-        if (PHP_VERSION_ID < 50400) {
+        if (\PHP_VERSION_ID < 50400) {
             return;
         }
 
diff --git a/src/Symfony/Component/Intl/Tests/Data/Bundle/Writer/PhpBundleWriterTest.php b/src/Symfony/Component/Intl/Tests/Data/Bundle/Writer/PhpBundleWriterTest.php
index a4c0330e0d..05bb9aad4f 100644
--- a/src/Symfony/Component/Intl/Tests/Data/Bundle/Writer/PhpBundleWriterTest.php
+++ b/src/Symfony/Component/Intl/Tests/Data/Bundle/Writer/PhpBundleWriterTest.php
@@ -69,7 +69,7 @@ class PhpBundleWriterTest extends TestCase
      */
     public function testWriteResourceBundle()
     {
-        if (PHP_VERSION_ID < 50315 || (PHP_VERSION_ID >= 50400 && PHP_VERSION_ID < 50404)) {
+        if (\PHP_VERSION_ID < 50315 || (\PHP_VERSION_ID >= 50400 && \PHP_VERSION_ID < 50404)) {
             $this->markTestSkipped('ResourceBundle implements Traversable only as of PHP 5.3.15 and 5.4.4');
         }
 
diff --git a/src/Symfony/Component/Intl/Tests/DateFormatter/AbstractIntlDateFormatterTest.php b/src/Symfony/Component/Intl/Tests/DateFormatter/AbstractIntlDateFormatterTest.php
index 43001a74fc..669365c567 100644
--- a/src/Symfony/Component/Intl/Tests/DateFormatter/AbstractIntlDateFormatterTest.php
+++ b/src/Symfony/Component/Intl/Tests/DateFormatter/AbstractIntlDateFormatterTest.php
@@ -37,7 +37,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
         $formatter = $this->getDateFormatter('en', IntlDateFormatter::MEDIUM, IntlDateFormatter::SHORT);
 
         // In PHP 5.5 default timezone depends on `date_default_timezone_get()` method
-        if (PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+        if (\PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
             $this->assertEquals(date_default_timezone_get(), $formatter->getTimeZoneId());
         } else {
             $this->assertNull($formatter->getTimeZoneId());
@@ -277,7 +277,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
     public function formatErrorProvider()
     {
         // With PHP 5.5 IntlDateFormatter accepts empty values ('0')
-        if (PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+        if (\PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
             return array(
                 array('y-M-d', 'foobar', 'datefmt_format: string \'foobar\' is not numeric, which would be required for it to be a valid date: U_ILLEGAL_ARGUMENT_ERROR'),
             );
@@ -330,7 +330,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
         );
 
         // As of PHP 5.5, intl ext no longer fallbacks invalid time zones to UTC
-        if (PHP_VERSION_ID < 50500 && !(extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+        if (\PHP_VERSION_ID < 50500 && !(extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
             // When time zone not exists, uses UTC by default
             $data[] = array(0, 'Foo/Bar', '1970-01-01 00:00:00');
             $data[] = array(0, 'UTC+04:30', '1970-01-01 00:00:00');
@@ -413,7 +413,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
     {
         $formatter = $this->getDefaultDateFormatter('zzzz');
 
-        if (PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+        if (\PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
             $formatter->setTimeZone('GMT+03:00');
         } else {
             $formatter->setTimeZoneId('GMT+03:00');
@@ -426,7 +426,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
     {
         $formatter = $this->getDefaultDateFormatter('zzzz');
 
-        if (PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+        if (\PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
             $formatter->setTimeZone('GMT+00:30');
         } else {
             $formatter->setTimeZoneId('GMT+00:30');
@@ -439,7 +439,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
     {
         $formatter = $this->getDefaultDateFormatter('zzzz');
 
-        if (PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+        if (\PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
             $formatter->setTimeZone('Pacific/Fiji');
         } else {
             $formatter->setTimeZoneId('Pacific/Fiji');
@@ -471,7 +471,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
 
     public function testFormatWithDateTimeZoneGmtOffset()
     {
-        if (defined('HHVM_VERSION_ID') || PHP_VERSION_ID <= 50509) {
+        if (defined('HHVM_VERSION_ID') || \PHP_VERSION_ID <= 50509) {
             $this->markTestSkipped('DateTimeZone GMT offsets are supported since 5.5.10. See https://github.com/facebook/hhvm/issues/5875 for HHVM.');
         }
 
@@ -485,7 +485,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
         if (!extension_loaded('intl')) {
             $this->markTestSkipped('Extension intl is required.');
         }
-        if (PHP_VERSION_ID < 50500 && !method_exists('IntlDateFormatter', 'setTimeZone')) {
+        if (\PHP_VERSION_ID < 50500 && !method_exists('IntlDateFormatter', 'setTimeZone')) {
             $this->markTestSkipped('Only in PHP 5.5+ IntlDateFormatter allows to use DateTimeZone objects.');
         }
 
@@ -496,7 +496,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
 
     public function testFormatWithTimezoneFromEnvironmentVariable()
     {
-        if (PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+        if (\PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
             $this->markTestSkipped('IntlDateFormatter in PHP 5.5 no longer depends on TZ environment.');
         }
 
@@ -519,7 +519,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
 
     public function testFormatWithTimezoneFromPhp()
     {
-        if (PHP_VERSION_ID < 50500 && !(extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+        if (\PHP_VERSION_ID < 50500 && !(extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
             $this->markTestSkipped('Only in PHP 5.5 IntlDateFormatter depends on default timezone (`date_default_timezone_get()`).');
         }
 
@@ -949,7 +949,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
     {
         $formatter = $this->getDefaultDateFormatter();
 
-        if (PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+        if (\PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
             $formatter->setTimeZone($timeZoneId);
         } else {
             $formatter->setTimeZoneId($timeZoneId);
@@ -960,7 +960,7 @@ abstract class AbstractIntlDateFormatterTest extends TestCase
 
     public function setTimeZoneIdProvider()
     {
-        $isPhp55 = PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'));
+        $isPhp55 = \PHP_VERSION_ID >= 50500 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'));
 
         return array(
             array('UTC', 'UTC'),
diff --git a/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php b/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php
index d91f9a292a..a3f86e2b51 100644
--- a/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php
+++ b/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php
@@ -701,7 +701,7 @@ abstract class AbstractNumberFormatterTest extends TestCase
 
         // Bug #59597 was fixed on PHP 5.3.14 and 5.4.4
         // The negative PHP_INT_MAX was being converted to float
-        if ((PHP_VERSION_ID < 50400 && PHP_VERSION_ID >= 50314) || PHP_VERSION_ID >= 50404 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+        if ((\PHP_VERSION_ID < 50400 && \PHP_VERSION_ID >= 50314) || \PHP_VERSION_ID >= 50404 || (extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
             $this->assertInternalType('int', $parsedValue);
         } else {
             $this->assertInternalType('float', $parsedValue);
@@ -758,7 +758,7 @@ abstract class AbstractNumberFormatterTest extends TestCase
 
         // Bug #59597 was fixed on PHP 5.3.14 and 5.4.4
         // A 32 bit integer was being generated instead of a 64 bit integer
-        if (PHP_VERSION_ID < 50314 || (PHP_VERSION_ID >= 50400 && PHP_VERSION_ID < 50404)) {
+        if (\PHP_VERSION_ID < 50314 || (\PHP_VERSION_ID >= 50400 && \PHP_VERSION_ID < 50404)) {
             $this->assertEquals(-2147483648, $parsedValue, '->parse() TYPE_INT64 does not use true 64 bit integers, using only the 32 bit range (PHP < 5.3.14 and PHP < 5.4.4).');
         } else {
             $this->assertEquals(2147483648, $parsedValue, '->parse() TYPE_INT64 uses true 64 bit integers (PHP >= 5.3.14 and PHP >= 5.4.4).');
@@ -769,7 +769,7 @@ abstract class AbstractNumberFormatterTest extends TestCase
 
         // Bug #59597 was fixed on PHP 5.3.14 and 5.4.4
         // A 32 bit integer was being generated instead of a 64 bit integer
-        if (PHP_VERSION_ID < 50314 || (PHP_VERSION_ID >= 50400 && PHP_VERSION_ID < 50404)) {
+        if (\PHP_VERSION_ID < 50314 || (\PHP_VERSION_ID >= 50400 && \PHP_VERSION_ID < 50404)) {
             $this->assertEquals(2147483647, $parsedValue, '->parse() TYPE_INT64 does not use true 64 bit integers, using only the 32 bit range  (PHP < 5.3.14 and PHP < 5.4.4).');
         } else {
             $this->assertEquals(-2147483649, $parsedValue, '->parse() TYPE_INT64 uses true 64 bit integers (PHP >= 5.3.14 and PHP >= 5.4.4).');
diff --git a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
index d7ccc46438..cdb075c846 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
@@ -166,7 +166,7 @@ class PropertyAccessor implements PropertyAccessorInterface
         $overwrite = true;
 
         try {
-            if (PHP_VERSION_ID < 70000 && false === self::$previousErrorHandler) {
+            if (\PHP_VERSION_ID < 70000 && false === self::$previousErrorHandler) {
                 self::$previousErrorHandler = set_error_handler(self::$errorHandler);
             }
 
@@ -222,7 +222,7 @@ class PropertyAccessor implements PropertyAccessorInterface
         } catch (\Throwable $e) {
         }
 
-        if (PHP_VERSION_ID < 70000 && false !== self::$previousErrorHandler) {
+        if (\PHP_VERSION_ID < 70000 && false !== self::$previousErrorHandler) {
             restore_error_handler();
             self::$previousErrorHandler = false;
         }
diff --git a/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
index b8fc03615f..d98e024640 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
@@ -64,7 +64,7 @@ class AnnotationFileLoader extends FileLoader
             $collection->addResource(new FileResource($path));
             $collection->addCollection($this->loader->load($class, $type));
         }
-        if (PHP_VERSION_ID >= 70000) {
+        if (\PHP_VERSION_ID >= 70000) {
             // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
             gc_mem_caches();
         }
diff --git a/src/Symfony/Component/Security/Csrf/TokenStorage/NativeSessionTokenStorage.php b/src/Symfony/Component/Security/Csrf/TokenStorage/NativeSessionTokenStorage.php
index 71151fa831..4923576e7c 100644
--- a/src/Symfony/Component/Security/Csrf/TokenStorage/NativeSessionTokenStorage.php
+++ b/src/Symfony/Component/Security/Csrf/TokenStorage/NativeSessionTokenStorage.php
@@ -108,7 +108,7 @@ class NativeSessionTokenStorage implements TokenStorageInterface
 
     private function startSession()
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             if (PHP_SESSION_NONE === session_status()) {
                 session_start();
             }
diff --git a/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategy.php b/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategy.php
index ccfa6ba67a..b431289392 100644
--- a/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategy.php
+++ b/src/Symfony/Component/Security/Http/Session/SessionAuthenticationStrategy.php
@@ -49,7 +49,7 @@ class SessionAuthenticationStrategy implements SessionAuthenticationStrategyInte
             case self::MIGRATE:
                 // Destroying the old session is broken in php 5.4.0 - 5.4.10
                 // See php bug #63379
-                $destroy = PHP_VERSION_ID < 50400 || PHP_VERSION_ID >= 50411;
+                $destroy = \PHP_VERSION_ID < 50400 || \PHP_VERSION_ID >= 50411;
                 $request->getSession()->migrate($destroy);
 
                 return;
diff --git a/src/Symfony/Component/Security/Http/Tests/Session/SessionAuthenticationStrategyTest.php b/src/Symfony/Component/Security/Http/Tests/Session/SessionAuthenticationStrategyTest.php
index 601c337588..d18c1c3ee7 100644
--- a/src/Symfony/Component/Security/Http/Tests/Session/SessionAuthenticationStrategyTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Session/SessionAuthenticationStrategyTest.php
@@ -40,7 +40,7 @@ class SessionAuthenticationStrategyTest extends TestCase
 
     public function testSessionIsMigrated()
     {
-        if (PHP_VERSION_ID >= 50400 && PHP_VERSION_ID < 50411) {
+        if (\PHP_VERSION_ID >= 50400 && \PHP_VERSION_ID < 50411) {
             $this->markTestSkipped('We cannot destroy the old session on PHP 5.4.0 - 5.4.10.');
         }
 
@@ -53,7 +53,7 @@ class SessionAuthenticationStrategyTest extends TestCase
 
     public function testSessionIsMigratedWithPhp54Workaround()
     {
-        if (PHP_VERSION_ID < 50400 || PHP_VERSION_ID >= 50411) {
+        if (\PHP_VERSION_ID < 50400 || \PHP_VERSION_ID >= 50411) {
             $this->markTestSkipped('This PHP version is not affected.');
         }
 
diff --git a/src/Symfony/Component/Serializer/Encoder/JsonDecode.php b/src/Symfony/Component/Serializer/Encoder/JsonDecode.php
index 5f5f2899f5..a7a11caf2e 100644
--- a/src/Symfony/Component/Serializer/Encoder/JsonDecode.php
+++ b/src/Symfony/Component/Serializer/Encoder/JsonDecode.php
@@ -101,7 +101,7 @@ class JsonDecode implements DecoderInterface
         $recursionDepth = $context['json_decode_recursion_depth'];
         $options = $context['json_decode_options'];
 
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $decodedData = json_decode($data, $associative, $recursionDepth, $options);
         } else {
             $decodedData = json_decode($data, $associative, $recursionDepth);
diff --git a/src/Symfony/Component/Templating/PhpEngine.php b/src/Symfony/Component/Templating/PhpEngine.php
index 75846455b9..de243d35e0 100644
--- a/src/Symfony/Component/Templating/PhpEngine.php
+++ b/src/Symfony/Component/Templating/PhpEngine.php
@@ -417,7 +417,7 @@ class PhpEngine implements EngineInterface, \ArrayAccess
     protected function initializeEscapers()
     {
         $that = $this;
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $flags = ENT_QUOTES | ENT_SUBSTITUTE;
         } else {
             $flags = ENT_QUOTES;
diff --git a/src/Symfony/Component/Translation/Tests/Dumper/JsonFileDumperTest.php b/src/Symfony/Component/Translation/Tests/Dumper/JsonFileDumperTest.php
index f54768418c..74d1c27b64 100644
--- a/src/Symfony/Component/Translation/Tests/Dumper/JsonFileDumperTest.php
+++ b/src/Symfony/Component/Translation/Tests/Dumper/JsonFileDumperTest.php
@@ -19,7 +19,7 @@ class JsonFileDumperTest extends TestCase
 {
     public function testDump()
     {
-        if (PHP_VERSION_ID < 50400) {
+        if (\PHP_VERSION_ID < 50400) {
             $this->markTestIncomplete('PHP below 5.4 doesn\'t support JSON pretty printing');
         }
 
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/AbstractComparisonValidatorTestCase.php b/src/Symfony/Component/Validator/Tests/Constraints/AbstractComparisonValidatorTestCase.php
index 856e49d6c5..9c8ce50fc3 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/AbstractComparisonValidatorTestCase.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/AbstractComparisonValidatorTestCase.php
@@ -36,7 +36,7 @@ abstract class AbstractComparisonValidatorTestCase extends AbstractConstraintVal
 {
     protected static function addPhp5Dot5Comparisons(array $comparisons)
     {
-        if (PHP_VERSION_ID < 50500) {
+        if (\PHP_VERSION_ID < 50500) {
             return $comparisons;
         }
 
@@ -130,7 +130,7 @@ abstract class AbstractComparisonValidatorTestCase extends AbstractConstraintVal
         if ($dirtyValue instanceof \DateTime || $dirtyValue instanceof \DateTimeInterface) {
             IntlTestHelper::requireIntl($this, '57.1');
 
-            if (PHP_VERSION_ID < 50304 && !(extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
+            if (\PHP_VERSION_ID < 50304 && !(extension_loaded('intl') && method_exists('IntlDateFormatter', 'setTimeZone'))) {
                 $this->markTestSkipped('Intl supports formatting DateTime objects since 5.3.4');
             }
         }
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/IdenticalToValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/IdenticalToValidatorTest.php
index 1acb41a66c..0b6a4e411a 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/IdenticalToValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/IdenticalToValidatorTest.php
@@ -64,7 +64,7 @@ class IdenticalToValidatorTest extends AbstractComparisonValidatorTestCase
             array(null, 1),
         );
 
-        if (PHP_VERSION_ID >= 50500) {
+        if (\PHP_VERSION_ID >= 50500) {
             $immutableDate = new \DateTimeImmutable('2000-01-01');
             $comparisons[] = array($immutableDate, $immutableDate);
         }
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/RangeValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/RangeValidatorTest.php
index ecee65cd81..b977a7e19c 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/RangeValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/RangeValidatorTest.php
@@ -194,7 +194,7 @@ class RangeValidatorTest extends AbstractConstraintValidatorTest
             array(new \DateTime('March 20, 2014')),
         );
 
-        if (PHP_VERSION_ID >= 50500) {
+        if (\PHP_VERSION_ID >= 50500) {
             $tests[] = array(new \DateTimeImmutable('March 10, 2014'));
             $tests[] = array(new \DateTimeImmutable('March 15, 2014'));
             $tests[] = array(new \DateTimeImmutable('March 20, 2014'));
@@ -216,7 +216,7 @@ class RangeValidatorTest extends AbstractConstraintValidatorTest
             array(new \DateTime('March 9, 2014'), 'Mar 9, 2014, 12:00 AM'),
         );
 
-        if (PHP_VERSION_ID >= 50500) {
+        if (\PHP_VERSION_ID >= 50500) {
             $tests[] = array(new \DateTimeImmutable('March 20, 2013'), 'Mar 20, 2013, 12:00 AM');
             $tests[] = array(new \DateTimeImmutable('March 9, 2014'), 'Mar 9, 2014, 12:00 AM');
         }
@@ -237,7 +237,7 @@ class RangeValidatorTest extends AbstractConstraintValidatorTest
             array(new \DateTime('March 9, 2015'), 'Mar 9, 2015, 12:00 AM'),
         );
 
-        if (PHP_VERSION_ID >= 50500) {
+        if (\PHP_VERSION_ID >= 50500) {
             $tests[] = array(new \DateTimeImmutable('March 21, 2014'), 'Mar 21, 2014, 12:00 AM');
             $tests[] = array(new \DateTimeImmutable('March 9, 2015'), 'Mar 9, 2015, 12:00 AM');
         }
diff --git a/src/Symfony/Component/VarDumper/Cloner/VarCloner.php b/src/Symfony/Component/VarDumper/Cloner/VarCloner.php
index af467056a5..6c9ede3ed5 100644
--- a/src/Symfony/Component/VarDumper/Cloner/VarCloner.php
+++ b/src/Symfony/Component/VarDumper/Cloner/VarCloner.php
@@ -308,7 +308,7 @@ class VarCloner extends AbstractCloner
         } else {
             // check if we are nested in an output buffering handler to prevent a fatal error with ob_start() below
             $obFuncs = array('ob_clean', 'ob_end_clean', 'ob_flush', 'ob_end_flush', 'ob_get_contents', 'ob_get_flush');
-            foreach (debug_backtrace(PHP_VERSION_ID >= 50400 ? DEBUG_BACKTRACE_IGNORE_ARGS : false) as $frame) {
+            foreach (debug_backtrace(\PHP_VERSION_ID >= 50400 ? DEBUG_BACKTRACE_IGNORE_ARGS : false) as $frame) {
                 if (isset($frame['function'][0]) && !isset($frame['class']) && 'o' === $frame['function'][0] && in_array($frame['function'], $obFuncs)) {
                     $frame['line'] = 0;
                     break;
diff --git a/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php b/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php
index 519e6a126b..f8acf0d562 100644
--- a/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php
@@ -45,7 +45,7 @@ class CliDumperTest extends VarDumperTestCase
         $closure54 = '';
         $r = defined('HHVM_VERSION') ? '' : '#%d';
 
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $closure54 = <<<EOTXT
 
     class: "Symfony\Component\VarDumper\Tests\CliDumperTest"
@@ -364,7 +364,7 @@ EOTXT
      */
     public function testBuggyRefs()
     {
-        if (PHP_VERSION_ID >= 50600) {
+        if (\PHP_VERSION_ID >= 50600) {
             $this->markTestSkipped('PHP 5.6 fixed refs counting');
         }
 
diff --git a/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php b/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php
index c3a8e1a6c9..6ba68c5c80 100644
--- a/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php
@@ -49,7 +49,7 @@ class HtmlDumperTest extends TestCase
         $closure54 = '';
         $r = defined('HHVM_VERSION') ? '' : '<a class=sf-dump-ref>#%d</a>';
 
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $closure54 = <<<EOTXT
 
     <span class=sf-dump-meta>class</span>: "<span class=sf-dump-str title="48 characters">Symfony\Component\VarDumper\Tests\HtmlDumperTest</span>"
diff --git a/src/Symfony/Component/VarDumper/Tests/Test/VarDumperTestTraitTest.php b/src/Symfony/Component/VarDumper/Tests/Test/VarDumperTestTraitTest.php
index a87476be75..81d1a0cf1b 100644
--- a/src/Symfony/Component/VarDumper/Tests/Test/VarDumperTestTraitTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/Test/VarDumperTestTraitTest.php
@@ -10,6 +10,6 @@
  */
 
 // Skipping trait tests for PHP < 5.4
-if (PHP_VERSION_ID >= 50400) {
+if (\PHP_VERSION_ID >= 50400) {
     require __DIR__.'/VarDumperTestTraitRequire54.php';
 }
diff --git a/src/Symfony/Component/Yaml/Exception/ParseException.php b/src/Symfony/Component/Yaml/Exception/ParseException.php
index 74548df1f8..ef36cfbadd 100644
--- a/src/Symfony/Component/Yaml/Exception/ParseException.php
+++ b/src/Symfony/Component/Yaml/Exception/ParseException.php
@@ -123,7 +123,7 @@ class ParseException extends RuntimeException
         }
 
         if (null !== $this->parsedFile) {
-            if (PHP_VERSION_ID >= 50400) {
+            if (\PHP_VERSION_ID >= 50400) {
                 $jsonOptions = JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE;
             } else {
                 $jsonOptions = 0;
diff --git a/src/Symfony/Component/Yaml/Tests/ParseExceptionTest.php b/src/Symfony/Component/Yaml/Tests/ParseExceptionTest.php
index 4f01ab938e..b7797fb7f3 100644
--- a/src/Symfony/Component/Yaml/Tests/ParseExceptionTest.php
+++ b/src/Symfony/Component/Yaml/Tests/ParseExceptionTest.php
@@ -19,7 +19,7 @@ class ParseExceptionTest extends TestCase
     public function testGetMessage()
     {
         $exception = new ParseException('Error message', 42, 'foo: bar', '/var/www/app/config.yml');
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $message = 'Error message in "/var/www/app/config.yml" at line 42 (near "foo: bar")';
         } else {
             $message = 'Error message in "\\/var\\/www\\/app\\/config.yml" at line 42 (near "foo: bar")';
@@ -31,7 +31,7 @@ class ParseExceptionTest extends TestCase
     public function testGetMessageWithUnicodeInFilename()
     {
         $exception = new ParseException('Error message', 42, 'foo: bar', 'äöü.yml');
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $message = 'Error message in "äöü.yml" at line 42 (near "foo: bar")';
         } else {
             $message = 'Error message in "\u00e4\u00f6\u00fc.yml" at line 42 (near "foo: bar")';