bug symfony#20883 Don’t compile when Opcache is not enabled on CLI (ruudk)

This PR was squashed before being merged into the 3.2 branch (closes symfony#20883).

Discussion
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Don’t compile when Opcache is not enabled on CLI

| Q             | A
| ------------- | ---
| Branch?       | 3.2
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#20878
| License       | MIT

This should fix symfony#20878 "Zend OPcache seems to be disabled, can't compile file" when Opcache is enabled, but `opcache.enable_cli` is turned off.

Commits
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5222643 Don’t compile when Opcache is not enabled on CLI

Author: fabpot

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

@@ -93,7 +93,7 @@ protected function doSave(array $values, $lifetime)
         $ok = true;
         $data = array($lifetime ? time() + $lifetime : PHP_INT_MAX, '');
 
-        foreach ($values as $id => $value) {
+        foreach ($values as $key => $value) {
             if (null === $value || is_object($value)) {
                 $value = serialize($value);
             } elseif (is_array($value)) {
@@ -109,13 +109,16 @@ protected function doSave(array $values, $lifetime)
                     $value = serialize($value);
                 }
             } elseif (!is_scalar($value)) {
-                throw new InvalidArgumentException(sprintf('Value of type "%s" is not serializable', $key, gettype($value)));
+                throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable %s value.', $key, gettype($value)));
             }
 
             $data[1] = $value;
-            $file = $this->getFile($id, true);
+            $file = $this->getFile($key, true);
             $ok = $this->write($file, '<?php return '.var_export($data, true).';') && $ok;
-            @opcache_compile_file($file);
+
+            if ('cli' !== PHP_SAPI || ini_get('opcache.enable_cli')) {
+                @opcache_compile_file($file);
+            }
         }
 
         return $ok;