diff --git a/src/Symfony/Component/Locale/Exception/MethodArgumentValueNotImplementedException.php b/src/Symfony/Component/Locale/Exception/MethodArgumentValueNotImplementedException.php
index 770f4181f6..2fdb6feaed 100644
--- a/src/Symfony/Component/Locale/Exception/MethodArgumentValueNotImplementedException.php
+++ b/src/Symfony/Component/Locale/Exception/MethodArgumentValueNotImplementedException.php
@@ -33,7 +33,7 @@ class MethodArgumentValueNotImplementedException extends NotImplementedException
             $methodName,
             $argName,
             var_export($argValue, true),
-            $additionalMessage != '' ? ' '.$additionalMessage.'. ' : ''
+            $additionalMessage !== '' ? ' '.$additionalMessage.'. ' : ''
         );
 
         parent::__construct($message);
diff --git a/src/Symfony/Component/Locale/Stub/DateFormat/TimeZoneTransformer.php b/src/Symfony/Component/Locale/Stub/DateFormat/TimeZoneTransformer.php
index d48e0a84b4..f817ba0d21 100644
--- a/src/Symfony/Component/Locale/Stub/DateFormat/TimeZoneTransformer.php
+++ b/src/Symfony/Component/Locale/Stub/DateFormat/TimeZoneTransformer.php
@@ -88,7 +88,7 @@ class TimeZoneTransformer extends Transformer
                 ));
             }
 
-            return 'Etc/GMT'.($hours != 0 ? $signal.$hours : '');
+            return 'Etc/GMT'.($hours !== 0 ? $signal.$hours : '');
         }
 
         throw new \InvalidArgumentException('The GMT time zone \'%s\' does not match with the supported formats GMT[+-]HH:MM or GMT[+-]HHMM.');
diff --git a/src/Symfony/Component/Locale/Stub/StubIntlDateFormatter.php b/src/Symfony/Component/Locale/Stub/StubIntlDateFormatter.php
index ec339043a1..ca21c9e82c 100644
--- a/src/Symfony/Component/Locale/Stub/StubIntlDateFormatter.php
+++ b/src/Symfony/Component/Locale/Stub/StubIntlDateFormatter.php
@@ -124,11 +124,11 @@ class StubIntlDateFormatter
      */
     public function __construct($locale, $datetype, $timetype, $timezone = null, $calendar = self::GREGORIAN, $pattern = null)
     {
-        if ('en' != $locale) {
+        if ('en' !== $locale) {
             throw new MethodArgumentValueNotImplementedException(__METHOD__, 'locale', $locale, 'Only the \'en\' locale is supported');
         }
 
-        if (self::GREGORIAN != $calendar) {
+        if (self::GREGORIAN !== $calendar) {
             throw new MethodArgumentValueNotImplementedException(__METHOD__, 'calendar', $calendar, 'Only the GREGORIAN calendar is supported');
         }
 
diff --git a/src/Symfony/Component/Locale/Stub/StubLocale.php b/src/Symfony/Component/Locale/Stub/StubLocale.php
index f4c3852e6d..831960f21b 100644
--- a/src/Symfony/Component/Locale/Stub/StubLocale.php
+++ b/src/Symfony/Component/Locale/Stub/StubLocale.php
@@ -480,7 +480,7 @@ class StubLocale
      */
     static private function getStubData($locale, $cacheVariable, $stubDataDir)
     {
-        if ('en' != $locale) {
+        if ('en' !== $locale) {
             throw new \InvalidArgumentException(sprintf('Only the \'en\' locale is supported. %s', NotImplementedException::INTL_INSTALL_MESSAGE));
         }
 
diff --git a/tests/Symfony/Tests/Component/Locale/Stub/StubIntlDateFormatterTest.php b/tests/Symfony/Tests/Component/Locale/Stub/StubIntlDateFormatterTest.php
index 2beb388e93..79bcd5299c 100644
--- a/tests/Symfony/Tests/Component/Locale/Stub/StubIntlDateFormatterTest.php
+++ b/tests/Symfony/Tests/Component/Locale/Stub/StubIntlDateFormatterTest.php
@@ -94,10 +94,10 @@ class StubIntlDateFormatterTest extends LocaleTestCase
         $this->assertSame($expected, $formatter->format($timestamp));
         $this->assertSame($errorMessage, StubIntl::getErrorMessage());
         $this->assertSame($errorCode, StubIntl::getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure(StubIntl::getErrorCode()));
+        $this->assertFalse(StubIntl::isFailure(StubIntl::getErrorCode()));
         $this->assertSame($errorMessage, $formatter->getErrorMessage());
         $this->assertSame($errorCode, $formatter->getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure($formatter->getErrorCode()));
+        $this->assertFalse(StubIntl::isFailure($formatter->getErrorCode()));
     }
 
     /**
@@ -115,7 +115,7 @@ class StubIntlDateFormatterTest extends LocaleTestCase
         $this->assertSame($expected, $formatter->format($timestamp));
         $this->assertSame($errorMessage, intl_get_error_message());
         $this->assertSame($errorCode, intl_get_error_code());
-        $this->assertSame($errorCode != 0, intl_is_failure(intl_get_error_code()));
+        $this->assertFalse(intl_is_failure(intl_get_error_code()));
     }
 
     public function formatProvider()
@@ -323,10 +323,10 @@ class StubIntlDateFormatterTest extends LocaleTestCase
         $this->assertFalse($formatter->format($timestamp));
         $this->assertSame($errorMessage, StubIntl::getErrorMessage());
         $this->assertSame($errorCode, StubIntl::getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure(StubIntl::getErrorCode()));
+        $this->assertTrue(StubIntl::isFailure(StubIntl::getErrorCode()));
         $this->assertSame($errorMessage, $formatter->getErrorMessage());
         $this->assertSame($errorCode, $formatter->getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure($formatter->getErrorCode()));
+        $this->assertTrue(StubIntl::isFailure($formatter->getErrorCode()));
     }
 
     /**
@@ -343,7 +343,7 @@ class StubIntlDateFormatterTest extends LocaleTestCase
         $this->assertFalse($formatter->format($timestamp));
         $this->assertSame($errorMessage, intl_get_error_message());
         $this->assertSame($errorCode, intl_get_error_code());
-        $this->assertSame($errorCode != 0, intl_is_failure(intl_get_error_code()));
+        $this->assertTrue(intl_is_failure(intl_get_error_code()));
     }
 
     public function formatErrorProvider()
@@ -598,7 +598,7 @@ class StubIntlDateFormatterTest extends LocaleTestCase
         $this->assertSame($expected, $formatter->parse($value));
         $this->assertSame($errorMessage, intl_get_error_message());
         $this->assertSame($errorCode, intl_get_error_code());
-        $this->assertSame($errorCode != 0, intl_is_failure(intl_get_error_code()));
+        $this->assertFalse(intl_is_failure(intl_get_error_code()));
     }
 
     /**
@@ -613,10 +613,10 @@ class StubIntlDateFormatterTest extends LocaleTestCase
         $this->assertSame($expected, $formatter->parse($value));
         $this->assertSame($errorMessage, StubIntl::getErrorMessage());
         $this->assertSame($errorCode, StubIntl::getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure(StubIntl::getErrorCode()));
+        $this->assertFalse(StubIntl::isFailure(StubIntl::getErrorCode()));
         $this->assertSame($errorMessage, $formatter->getErrorMessage());
         $this->assertSame($errorCode, $formatter->getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure($formatter->getErrorCode()));
+        $this->assertFalse(StubIntl::isFailure($formatter->getErrorCode()));
     }
 
     public function parseProvider()
@@ -775,7 +775,7 @@ class StubIntlDateFormatterTest extends LocaleTestCase
         $this->assertFalse($formatter->parse($value));
         $this->assertSame($errorMessage, intl_get_error_message());
         $this->assertSame($errorCode, intl_get_error_code());
-        $this->assertSame($errorCode != 0, intl_is_failure(intl_get_error_code()));
+        $this->assertTrue(intl_is_failure(intl_get_error_code()));
     }
 
     /**
@@ -790,10 +790,10 @@ class StubIntlDateFormatterTest extends LocaleTestCase
         $this->assertFalse($formatter->parse($value));
         $this->assertSame($errorMessage, StubIntl::getErrorMessage());
         $this->assertSame($errorCode, StubIntl::getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure(StubIntl::getErrorCode()));
+        $this->assertTrue(StubIntl::isFailure(StubIntl::getErrorCode()));
         $this->assertSame($errorMessage, $formatter->getErrorMessage());
         $this->assertSame($errorCode, $formatter->getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure($formatter->getErrorCode()));
+        $this->assertTrue(StubIntl::isFailure($formatter->getErrorCode()));
     }
 
     public function parseErrorProvider()
diff --git a/tests/Symfony/Tests/Component/Locale/Stub/StubNumberFormatterTest.php b/tests/Symfony/Tests/Component/Locale/Stub/StubNumberFormatterTest.php
index 1236598ab7..e775763aee 100644
--- a/tests/Symfony/Tests/Component/Locale/Stub/StubNumberFormatterTest.php
+++ b/tests/Symfony/Tests/Component/Locale/Stub/StubNumberFormatterTest.php
@@ -233,10 +233,10 @@ class StubNumberFormatterTest extends LocaleTestCase
 
         $this->assertSame($errorMessage, StubIntl::getErrorMessage());
         $this->assertSame($errorCode, StubIntl::getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure(StubIntl::getErrorCode()));
+        $this->assertFalse(StubIntl::isFailure(StubIntl::getErrorCode()));
         $this->assertSame($errorMessage, $formatter->getErrorMessage());
         $this->assertSame($errorCode, $formatter->getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure($formatter->getErrorCode()));
+        $this->assertFalse(StubIntl::isFailure($formatter->getErrorCode()));
     }
 
     public function testFormatIntl()
@@ -251,10 +251,10 @@ class StubNumberFormatterTest extends LocaleTestCase
 
         $this->assertSame($errorMessage, intl_get_error_message());
         $this->assertSame($errorCode, intl_get_error_code());
-        $this->assertSame($errorCode != 0, intl_is_failure(intl_get_error_code()));
+        $this->assertFalse(intl_is_failure(intl_get_error_code()));
         $this->assertSame($errorMessage, $formatter->getErrorMessage());
         $this->assertSame($errorCode, $formatter->getErrorCode());
-        $this->assertSame($errorCode != 0, intl_is_failure($formatter->getErrorCode()));
+        $this->assertFalse(intl_is_failure($formatter->getErrorCode()));
     }
 
     /**
@@ -699,10 +699,10 @@ class StubNumberFormatterTest extends LocaleTestCase
 
         $this->assertSame($errorMessage, StubIntl::getErrorMessage());
         $this->assertSame($errorCode, StubIntl::getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure(StubIntl::getErrorCode()));
+        $this->assertSame($errorCode !== 0, StubIntl::isFailure(StubIntl::getErrorCode()));
         $this->assertSame($errorMessage, $formatter->getErrorMessage());
         $this->assertSame($errorCode, $formatter->getErrorCode());
-        $this->assertSame($errorCode != 0, StubIntl::isFailure($formatter->getErrorCode()));
+        $this->assertSame($errorCode !== 0, StubIntl::isFailure($formatter->getErrorCode()));
     }
 
     /**
@@ -727,10 +727,10 @@ class StubNumberFormatterTest extends LocaleTestCase
 
         $this->assertSame($errorMessage, intl_get_error_message());
         $this->assertSame($errorCode, intl_get_error_code());
-        $this->assertSame($errorCode != 0, intl_is_failure(intl_get_error_code()));
+        $this->assertSame($errorCode > 0, intl_is_failure(intl_get_error_code()));
         $this->assertSame($errorMessage, $formatter->getErrorMessage());
         $this->assertSame($errorCode, $formatter->getErrorCode());
-        $this->assertSame($errorCode != 0, intl_is_failure($formatter->getErrorCode()));
+        $this->assertSame($errorCode > 0, intl_is_failure($formatter->getErrorCode()));
     }
 
     public function parseProvider()