minor symfony#20902 [Cache] Improve performances into foreach (PhpFilesAdapter) (hadjedjvincent)

This PR was squashed before being merged into the 3.2 branch (closes symfony#20902).

Discussion
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[Cache] Improve performances into foreach (PhpFilesAdapter)

| Q             | A
| ------------- | ---
| Branch?       | 3.2
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| License       | MIT

Let's prevent some useless call to be made into this foreach (ini_get)

Commits
-------

7e4573b [Cache] Improve performances into foreach (PhpFilesAdapter)

Author: nicolas-grekas

src/Symfony/Component/Cache/Adapter/PhpFilesAdapter.php

@@ -92,6 +92,7 @@ protected function doSave(array $values, $lifetime)
     {
         $ok = true;
         $data = array($lifetime ? time() + $lifetime : PHP_INT_MAX, '');
+        $allowCompile = 'cli' !== PHP_SAPI || ini_get('opcache.enable_cli');
 
         foreach ($values as $key => $value) {
             if (null === $value || is_object($value)) {
@@ -116,7 +117,7 @@ protected function doSave(array $values, $lifetime)
             $file = $this->getFile($key, true);
             $ok = $this->write($file, '<?php return '.var_export($data, true).';') && $ok;
 
-            if ('cli' !== PHP_SAPI || ini_get('opcache.enable_cli')) {
+            if ($allowCompile) {
                 @opcache_compile_file($file);
             }
         }