diff --git a/src/Symfony/Bundle/FrameworkBundle/Translation/PhpExtractor.php b/src/Symfony/Bundle/FrameworkBundle/Translation/PhpExtractor.php
index e8479eb5cf..f68f8a7979 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Translation/PhpExtractor.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Translation/PhpExtractor.php
@@ -61,6 +61,11 @@ class PhpExtractor implements ExtractorInterface
         $files = $finder->files()->name('*.php')->in($directory);
         foreach ($files as $file) {
             $this->parseTokens(token_get_all(file_get_contents($file)), $catalog);
+
+            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();
+            }
         }
     }
 
@@ -81,7 +86,7 @@ class PhpExtractor implements ExtractorInterface
      */
     protected function normalizeToken($token)
     {
-        if (is_array($token)) {
+        if (isset($token[1]) && 'b"' !== $token) {
             return $token[1];
         }
 
@@ -95,7 +100,7 @@ class PhpExtractor implements ExtractorInterface
     {
         for (; $tokenIterator->valid(); $tokenIterator->next()) {
             $t = $tokenIterator->current();
-            if (!is_array($t) || ($t[0] !== T_WHITESPACE)) {
+            if (T_WHITESPACE !== $t[0]) {
                 break;
             }
         }
@@ -112,7 +117,7 @@ class PhpExtractor implements ExtractorInterface
 
         for (; $tokenIterator->valid(); $tokenIterator->next()) {
             $t = $tokenIterator->current();
-            if (!is_array($t)) {
+            if (!isset($t[1])) {
                 break;
             }
 
diff --git a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
index f811cd0a71..ba0b2e032a 100644
--- a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
+++ b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
@@ -149,8 +149,9 @@ class ClassCollectionLoader
         $inNamespace = false;
         $tokens = token_get_all($source);
 
-        for (reset($tokens); false !== $token = current($tokens); next($tokens)) {
-            if (is_string($token)) {
+        for ($i = 0; isset($tokens[$i]); ++$i) {
+            $token = $tokens[$i];
+            if (!isset($token[1]) || 'b"' === $token) {
                 $rawChunk .= $token;
             } elseif (in_array($token[0], array(T_COMMENT, T_DOC_COMMENT))) {
                 // strip comments
@@ -162,12 +163,12 @@ class ClassCollectionLoader
                 $rawChunk .= $token[1];
 
                 // namespace name and whitespaces
-                while (($t = next($tokens)) && is_array($t) && in_array($t[0], array(T_WHITESPACE, T_NS_SEPARATOR, T_STRING))) {
-                    $rawChunk .= $t[1];
+                while (isset($tokens[++$i][1]) && in_array($tokens[$i][0], array(T_WHITESPACE, T_NS_SEPARATOR, T_STRING))) {
+                    $rawChunk .= $tokens[$i][1];
                 }
-                if ('{' === $t) {
+                if ('{' === $tokens[$i]) {
                     $inNamespace = false;
-                    prev($tokens);
+                    --$i;
                 } else {
                     $rawChunk = rtrim($rawChunk)."\n{";
                     $inNamespace = true;
@@ -175,8 +176,8 @@ class ClassCollectionLoader
             } elseif (T_START_HEREDOC === $token[0]) {
                 $output .= self::compressCode($rawChunk).$token[1];
                 do {
-                    $token = next($tokens);
-                    $output .= is_string($token) ? $token : $token[1];
+                    $token = $tokens[++$i];
+                    $output .= isset($token[1]) && 'b"' !== $token ? $token[1] : $token;
                 } while ($token[0] !== T_END_HEREDOC);
                 $output .= "\n";
                 $rawChunk = '';
@@ -192,7 +193,15 @@ class ClassCollectionLoader
             $rawChunk .= "}\n";
         }
 
-        return $output.self::compressCode($rawChunk);
+        $output .= self::compressCode($rawChunk);
+
+        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();
+        }
+
+        return $output;
     }
 
     /**
diff --git a/src/Symfony/Component/ClassLoader/ClassMapGenerator.php b/src/Symfony/Component/ClassLoader/ClassMapGenerator.php
index a4ddce5115..07c974f428 100644
--- a/src/Symfony/Component/ClassLoader/ClassMapGenerator.php
+++ b/src/Symfony/Component/ClassLoader/ClassMapGenerator.php
@@ -72,6 +72,11 @@ class ClassMapGenerator
 
             $classes = self::findClasses($path);
 
+            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();
+            }
+
             foreach ($classes as $class) {
                 $map[$class] = $path;
             }
@@ -95,10 +100,10 @@ class ClassMapGenerator
         $classes = array();
 
         $namespace = '';
-        for ($i = 0, $max = count($tokens); $i < $max; ++$i) {
+        for ($i = 0; isset($tokens[$i]); ++$i) {
             $token = $tokens[$i];
 
-            if (is_string($token)) {
+            if (!isset($token[1])) {
                 continue;
             }
 
@@ -108,9 +113,9 @@ class ClassMapGenerator
                 case T_NAMESPACE:
                     $namespace = '';
                     // If there is a namespace, extract it
-                    while (($t = $tokens[++$i]) && is_array($t)) {
-                        if (in_array($t[0], array(T_STRING, T_NS_SEPARATOR))) {
-                            $namespace .= $t[1];
+                    while (isset($tokens[++$i][1])) {
+                        if (in_array($tokens[$i][0], array(T_STRING, T_NS_SEPARATOR))) {
+                            $namespace .= $tokens[$i][1];
                         }
                     }
                     $namespace .= '\\';
@@ -121,7 +126,7 @@ class ClassMapGenerator
                     // Skip usage of ::class constant
                     $isClassConstant = false;
                     for ($j = $i - 1; $j > 0; --$j) {
-                        if (is_string($tokens[$j])) {
+                        if (!isset($tokens[$j][1])) {
                             break;
                         }
 
@@ -138,10 +143,11 @@ class ClassMapGenerator
                     }
 
                     // Find the classname
-                    while (($t = $tokens[++$i]) && is_array($t)) {
+                    while (isset($tokens[++$i][1])) {
+                        $t = $tokens[$i];
                         if (T_STRING === $t[0]) {
                             $class .= $t[1];
-                        } elseif ($class !== '' && T_WHITESPACE == $t[0]) {
+                        } elseif ('' !== $class && T_WHITESPACE === $t[0]) {
                             break;
                         }
                     }
diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index 04ec2c240b..fa849e02a1 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -699,14 +699,15 @@ abstract class Kernel implements KernelInterface, TerminableInterface
         $output = '';
         $tokens = token_get_all($source);
         $ignoreSpace = false;
-        for (reset($tokens); false !== $token = current($tokens); next($tokens)) {
-            if (is_string($token)) {
+        for ($i = 0; isset($tokens[$i]); ++$i) {
+            $token = $tokens[$i];
+            if (!isset($token[1]) || 'b"' === $token) {
                 $rawChunk .= $token;
             } elseif (T_START_HEREDOC === $token[0]) {
                 $output .= $rawChunk.$token[1];
                 do {
-                    $token = next($tokens);
-                    $output .= $token[1];
+                    $token = $tokens[++$i];
+                    $output .= isset($token[1]) && 'b"' !== $token ? $token[1] : $token;
                 } while ($token[0] !== T_END_HEREDOC);
                 $rawChunk = '';
             } elseif (T_WHITESPACE === $token[0]) {
@@ -732,6 +733,12 @@ abstract class Kernel implements KernelInterface, TerminableInterface
 
         $output .= $rawChunk;
 
+        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();
+        }
+
         return $output;
     }
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/KernelTest.php b/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
index 6bf5c25884..fa1294e806 100644
--- a/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
@@ -307,7 +307,7 @@ modified';
 $heredoc = <<<HD
 
 
-Heredoc should not be   modified
+Heredoc should not be   modified {$a[1+$b]}
 
 
 HD;
@@ -343,7 +343,7 @@ modified';
 $heredoc = <<<HD
 
 
-Heredoc should not be   modified
+Heredoc should not be   modified {$a[1+$b]}
 
 
 HD;
diff --git a/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
index 8ce57ac18c..a3a7e0e5ae 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
@@ -64,6 +64,10 @@ class AnnotationFileLoader extends FileLoader
             $collection->addResource(new FileResource($path));
             $collection->addCollection($this->loader->load($class, $type));
         }
+        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();
+        }
 
         return $collection;
     }
@@ -88,10 +92,10 @@ class AnnotationFileLoader extends FileLoader
         $class = false;
         $namespace = false;
         $tokens = token_get_all(file_get_contents($file));
-        for ($i = 0, $count = count($tokens); $i < $count; ++$i) {
+        for ($i = 0; isset($tokens[$i]); ++$i) {
             $token = $tokens[$i];
 
-            if (!is_array($token)) {
+            if (!isset($token[1])) {
                 continue;
             }
 
@@ -100,11 +104,11 @@ class AnnotationFileLoader extends FileLoader
             }
 
             if (true === $namespace && T_STRING === $token[0]) {
-                $namespace = '';
-                do {
-                    $namespace .= $token[1];
-                    $token = $tokens[++$i];
-                } while ($i < $count && is_array($token) && in_array($token[0], array(T_NS_SEPARATOR, T_STRING)));
+                $namespace = $token[1];
+                while (isset($tokens[++$i][1]) && in_array($tokens[$i][0], array(T_NS_SEPARATOR, T_STRING))) {
+                    $namespace .= $tokens[$i][1];
+                }
+                $token = $tokens[$i];
             }
 
             if (T_CLASS === $token[0]) {