Restored the deleted adapter cache file

Author: javiereguiluz

components/cache/adapters/array_cache_adapter.rst

@@ -0,0 +1,27 @@
+.. index::
+    single: Cache Pool
+    single: Array Cache
+
+Array Cache Adapter
+===================
+
+Generally, this adapter is useful for testing purposes, as its contents are stored in memory
+and not persisted outside the running PHP process in any way. It can also be useful while
+warming up caches, due to the :method:`Symfony\\Component\\Cache\\Adapter\\ArrayAdapter::getValues`
+method.
+
+This adapter can be passed a default cache lifetime as its first parameter, and a boolean that
+toggles serialization as its second parameter::
+
+    use Symfony\Component\Cache\Adapter\ArrayAdapter;
+
+    $cache = new ArrayAdapter(
+
+        // the default lifetime (in seconds) for cache items that do not define their
+        // own lifetime, with a value 0 causing items to be stored indefinitely (i.e.
+        // until the current PHP process finishes)
+        $defaultLifetime = 0,
+
+        // if ``true``, the values saved in the cache are serialized before storing them
+        $storeSerialized = true
+    );