diff --git a/UPGRADE-3.0.md b/UPGRADE-3.0.md
index 9ec4987b3b..5d36e2675a 100644
--- a/UPGRADE-3.0.md
+++ b/UPGRADE-3.0.md
@@ -681,7 +681,7 @@ UPGRADE FROM 2.x to 3.0
    As a value for the option you must provide the fully-qualified class name (FQCN)
    now as well.
 
- * The `FormIntegrationTestCase` and `FormPerformanceTestCase` classes were moved form the `Symfony\Component\Form\Tests` namespace to the `Symfony\Component\Form\Test` namespace.
+ * The `FormIntegrationTestCase` and `FormPerformanceTestCase` classes were moved from the `Symfony\Component\Form\Tests` namespace to the `Symfony\Component\Form\Test` namespace.
 
  * The constants `ROUND_HALFEVEN`, `ROUND_HALFUP` and `ROUND_HALFDOWN` in class
    `NumberToLocalizedStringTransformer` were renamed to `ROUND_HALF_EVEN`,
diff --git a/src/Symfony/Component/ClassLoader/Tests/ApcClassLoaderTest.php b/src/Symfony/Component/ClassLoader/Tests/ApcClassLoaderTest.php
index ec5066803d..70896f3136 100644
--- a/src/Symfony/Component/ClassLoader/Tests/ApcClassLoaderTest.php
+++ b/src/Symfony/Component/ClassLoader/Tests/ApcClassLoaderTest.php
@@ -22,7 +22,7 @@ class ApcClassLoaderTest extends TestCase
 {
     protected function setUp()
     {
-        if (!(ini_get('apc.enabled') && ini_get('apc.enable_cli'))) {
+        if (!(filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) && filter_var(ini_get('apc.enable_cli'), FILTER_VALIDATE_BOOLEAN))) {
             $this->markTestSkipped('The apc extension is not enabled.');
         } else {
             apcu_clear_cache();
@@ -31,7 +31,7 @@ class ApcClassLoaderTest extends TestCase
 
     protected function tearDown()
     {
-        if (ini_get('apc.enabled') && ini_get('apc.enable_cli')) {
+        if (filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) && filter_var(ini_get('apc.enable_cli'), FILTER_VALIDATE_BOOLEAN)) {
             apcu_clear_cache();
         }
     }
diff --git a/src/Symfony/Component/Config/ResourceCheckerConfigCache.php b/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
index 87e2c5d9f0..91feed6228 100644
--- a/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
+++ b/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
@@ -137,7 +137,7 @@ class ResourceCheckerConfigCache implements ConfigCacheInterface
             }
         }
 
-        if (\function_exists('opcache_invalidate') && ini_get('opcache.enable')) {
+        if (\function_exists('opcache_invalidate') && filter_var(ini_get('opcache.enable'), FILTER_VALIDATE_BOOLEAN)) {
             @opcache_invalidate($this->file, true);
         }
     }
diff --git a/src/Symfony/Component/Debug/Debug.php b/src/Symfony/Component/Debug/Debug.php
index c296d0f65a..2a3d7f3159 100644
--- a/src/Symfony/Component/Debug/Debug.php
+++ b/src/Symfony/Component/Debug/Debug.php
@@ -45,7 +45,7 @@ class Debug
         if (!\in_array(\PHP_SAPI, array('cli', 'phpdbg'), true)) {
             ini_set('display_errors', 0);
             ExceptionHandler::register();
-        } elseif ($displayErrors && (!ini_get('log_errors') || ini_get('error_log'))) {
+        } elseif ($displayErrors && (!filter_var(ini_get('log_errors'), FILTER_VALIDATE_BOOLEAN) || ini_get('error_log'))) {
             // CLI - display errors only if they're not already logged to STDERR
             ini_set('display_errors', 1);
         }
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
index 07eac4023e..abfd939f5f 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
@@ -68,8 +68,8 @@ class ConfigDataCollector extends DataCollector implements LateDataCollectorInte
             'php_intl_locale' => class_exists('Locale', false) && \Locale::getDefault() ? \Locale::getDefault() : 'n/a',
             'php_timezone' => date_default_timezone_get(),
             'xdebug_enabled' => \extension_loaded('xdebug'),
-            'apcu_enabled' => \extension_loaded('apcu') && ini_get('apc.enabled'),
-            'zend_opcache_enabled' => \extension_loaded('Zend OPcache') && ini_get('opcache.enable'),
+            'apcu_enabled' => \extension_loaded('apcu') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN),
+            'zend_opcache_enabled' => \extension_loaded('Zend OPcache') && filter_var(ini_get('opcache.enable'), FILTER_VALIDATE_BOOLEAN),
             'bundles' => array(),
             'sapi_name' => \PHP_SAPI,
         );
diff --git a/src/Symfony/Component/HttpKernel/Tests/DataCollector/ConfigDataCollectorTest.php b/src/Symfony/Component/HttpKernel/Tests/DataCollector/ConfigDataCollectorTest.php
index a99e34ad42..ed614357e1 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DataCollector/ConfigDataCollectorTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DataCollector/ConfigDataCollectorTest.php
@@ -39,8 +39,8 @@ class ConfigDataCollectorTest extends TestCase
         $this->assertSame(Kernel::VERSION, $c->getSymfonyVersion());
         $this->assertNull($c->getToken());
         $this->assertSame(\extension_loaded('xdebug'), $c->hasXDebug());
-        $this->assertSame(\extension_loaded('Zend OPcache') && ini_get('opcache.enable'), $c->hasZendOpcache());
-        $this->assertSame(\extension_loaded('apcu') && ini_get('apc.enabled'), $c->hasApcu());
+        $this->assertSame(\extension_loaded('Zend OPcache') && filter_var(ini_get('opcache.enable'), FILTER_VALIDATE_BOOLEAN)), $c->hasZendOpcache());
+        $this->assertSame(\extension_loaded('apcu') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN)), $c->hasApcu());
     }
 }