diff --git a/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php b/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php
index e03d37b94d..6df00d1d33 100644
--- a/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php
@@ -61,14 +61,13 @@ class PhpArrayAdapter implements AdapterInterface, PruneableInterface, Resettabl
      * fallback pool with this adapter only if the current PHP version is supported.
      *
      * @param string                 $file         The PHP file were values are cached
-     * @param CacheItemPoolInterface $fallbackPool Fallback for old PHP versions or opcache disabled
+     * @param CacheItemPoolInterface $fallbackPool A pool to fallback on when an item is not hit
      *
      * @return CacheItemPoolInterface
      */
     public static function create($file, CacheItemPoolInterface $fallbackPool)
     {
-        // Shared memory is available in PHP 7.0+ with OPCache enabled and in HHVM
-        if ((\PHP_VERSION_ID >= 70000 && filter_var(ini_get('opcache.enable'), FILTER_VALIDATE_BOOLEAN)) || \defined('HHVM_VERSION')) {
+        if (\PHP_VERSION_ID >= 70000) {
             if (!$fallbackPool instanceof AdapterInterface) {
                 $fallbackPool = new ProxyAdapter($fallbackPool);
             }
diff --git a/src/Symfony/Component/Cache/Simple/PhpArrayCache.php b/src/Symfony/Component/Cache/Simple/PhpArrayCache.php
index 607555e93b..5ded7ee741 100644
--- a/src/Symfony/Component/Cache/Simple/PhpArrayCache.php
+++ b/src/Symfony/Component/Cache/Simple/PhpArrayCache.php
@@ -44,14 +44,14 @@ class PhpArrayCache implements CacheInterface, PruneableInterface, ResettableInt
      * stores arrays in its latest versions. This factory method decorates the given
      * fallback pool with this adapter only if the current PHP version is supported.
      *
-     * @param string $file The PHP file were values are cached
+     * @param string         $file         The PHP file were values are cached
+     * @param CacheInterface $fallbackPool A pool to fallback on when an item is not hit
      *
      * @return CacheInterface
      */
     public static function create($file, CacheInterface $fallbackPool)
     {
-        // Shared memory is available in PHP 7.0+ with OPCache enabled and in HHVM
-        if ((\PHP_VERSION_ID >= 70000 && filter_var(ini_get('opcache.enable'), FILTER_VALIDATE_BOOLEAN)) || \defined('HHVM_VERSION')) {
+        if (\PHP_VERSION_ID >= 70000) {
             return new static($file, $fallbackPool);
         }
 
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php
index 751f758cc2..f88a718739 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterTest.php
@@ -62,6 +62,8 @@ class PhpArrayAdapterTest extends AdapterTestCase
 
     protected function tearDown()
     {
+        $this->createCachePool()->clear();
+
         if (file_exists(sys_get_temp_dir().'/symfony-cache')) {
             FilesystemAdapterTest::rmdir(sys_get_temp_dir().'/symfony-cache');
         }
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterWithFallbackTest.php b/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterWithFallbackTest.php
index 4bdd7580fc..0bfd5c3947 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterWithFallbackTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/PhpArrayAdapterWithFallbackTest.php
@@ -37,6 +37,8 @@ class PhpArrayAdapterWithFallbackTest extends AdapterTestCase
 
     protected function tearDown()
     {
+        $this->createCachePool()->clear();
+
         if (file_exists(sys_get_temp_dir().'/symfony-cache')) {
             FilesystemAdapterTest::rmdir(sys_get_temp_dir().'/symfony-cache');
         }
diff --git a/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheTest.php b/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheTest.php
index c18f714429..bcd7dea553 100644
--- a/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheTest.php
+++ b/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheTest.php
@@ -56,6 +56,8 @@ class PhpArrayCacheTest extends CacheTestCase
 
     protected function tearDown()
     {
+        $this->createSimpleCache()->clear();
+
         if (file_exists(sys_get_temp_dir().'/symfony-cache')) {
             FilesystemAdapterTest::rmdir(sys_get_temp_dir().'/symfony-cache');
         }
diff --git a/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheWithFallbackTest.php b/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheWithFallbackTest.php
index eba749cece..b08c16043c 100644
--- a/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheWithFallbackTest.php
+++ b/src/Symfony/Component/Cache/Tests/Simple/PhpArrayCacheWithFallbackTest.php
@@ -43,6 +43,8 @@ class PhpArrayCacheWithFallbackTest extends CacheTestCase
 
     protected function tearDown()
     {
+        $this->createSimpleCache()->clear();
+
         if (file_exists(sys_get_temp_dir().'/symfony-cache')) {
             FilesystemAdapterTest::rmdir(sys_get_temp_dir().'/symfony-cache');
         }
diff --git a/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php b/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php
index ea996a217c..2400486f80 100644
--- a/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php
+++ b/src/Symfony/Component/Cache/Traits/PhpArrayTrait.php
@@ -28,6 +28,8 @@ trait PhpArrayTrait
     private $values;
     private $zendDetectUnicode;
 
+    private static $valuesCache = [];
+
     /**
      * Store an array of cached values.
      *
@@ -107,6 +109,7 @@ EOF;
         unset($serialized, $unserialized, $value, $dump);
 
         @rename($tmpFile, $this->file);
+        unset(self::$valuesCache[$this->file]);
 
         $this->initialize();
     }
@@ -119,6 +122,7 @@ EOF;
         $this->values = [];
 
         $cleared = @unlink($this->file) || !file_exists($this->file);
+        unset(self::$valuesCache[$this->file]);
 
         return $this->pool->clear() && $cleared;
     }
@@ -128,11 +132,17 @@ EOF;
      */
     private function initialize()
     {
+        if (isset(self::$valuesCache[$this->file])) {
+            $this->values = self::$valuesCache[$this->file];
+
+            return;
+        }
+
         if ($this->zendDetectUnicode) {
             $zmb = ini_set('zend.detect_unicode', 0);
         }
         try {
-            $this->values = file_exists($this->file) ? (include $this->file ?: []) : [];
+            $this->values = self::$valuesCache[$this->file] = file_exists($this->file) ? (include $this->file ?: []) : [];
         } finally {
             if ($this->zendDetectUnicode) {
                 ini_set('zend.detect_unicode', $zmb);