diff --git a/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php b/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php
index 2553b9ea2ab4..5d8ea6f0868a 100644
--- a/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php
@@ -80,7 +80,7 @@ public function testOneVar()
 }
 
 EOTXT;
-        $expected = preg_replace('/%(.*?)%/', version_compare(PHP_VERSION, '5.4.0') >= 0 ? '(isset($context["$1"]) ? $context["$1"] : null)' : '$this->getContext($context, "$1")', $expected);
+        $expected = preg_replace('/%(.*?)%/', PHP_VERSION_ID >= 50400 ? '(isset($context["$1"]) ? $context["$1"] : null)' : '$this->getContext($context, "$1")', $expected);
 
         $this->assertSame($expected, $compiler->compile($node)->getSource());
     }
@@ -106,7 +106,7 @@ public function testMultiVars()
 }
 
 EOTXT;
-        $expected = preg_replace('/%(.*?)%/', version_compare(PHP_VERSION, '5.4.0') >= 0 ? '(isset($context["$1"]) ? $context["$1"] : null)' : '$this->getContext($context, "$1")', $expected);
+        $expected = preg_replace('/%(.*?)%/', PHP_VERSION_ID >= 50400 ? '(isset($context["$1"]) ? $context["$1"] : null)' : '$this->getContext($context, "$1")', $expected);
 
         $this->assertSame($expected, $compiler->compile($node)->getSource());
     }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ServerCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ServerCommand.php
index 32f749f79f66..b979a19f0f73 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 (version_compare(phpversion(), '5.4.0', '<') || defined('HHVM_VERSION')) {
+        if (PHP_VERSION_ID < 50400 || defined('HHVM_VERSION')) {
             return false;
         }
 
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/AbstractComparisonValidatorTestCase.php b/src/Symfony/Component/Validator/Tests/Constraints/AbstractComparisonValidatorTestCase.php
index fb85315b3334..aa111a37f3d5 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 (version_compare(PHP_VERSION, '5.5.0-dev', '<')) {
+        if (PHP_VERSION_ID < 50500) {
             return $comparisons;
         }
 
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/IdenticalToValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/IdenticalToValidatorTest.php
index 4b71062f0593..ef0c6f177aef 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/IdenticalToValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/IdenticalToValidatorTest.php
@@ -64,7 +64,7 @@ public function provideValidComparisons()
             array(null, 1),
         );
 
-        if (version_compare(PHP_VERSION, '>=', '5.5')) {
+        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 9b7056b54873..b43cc20d3c9f 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/RangeValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/RangeValidatorTest.php
@@ -194,7 +194,7 @@ public function getTenthToTwentiethMarch2014()
             array(new \DateTime('March 20, 2014')),
         );
 
-        if (version_compare(PHP_VERSION, '5.5.0-dev', '>=')) {
+        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 @@ public function getSoonerThanTenthMarch2014()
             array(new \DateTime('March 9, 2014'), 'Mar 9, 2014, 12:00 AM'),
         );
 
-        if (version_compare(PHP_VERSION, '5.5.0-dev', '>=')) {
+        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 @@ public function getLaterThanTwentiethMarch2014()
             array(new \DateTime('March 9, 2015'), 'Mar 9, 2015, 12:00 AM'),
         );
 
-        if (version_compare(PHP_VERSION, '5.5.0-dev', '>=')) {
+        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');
         }