Merge pull request #4861 from v12mike/PHPBB3-15247

[PHPBB3-15247] Add support for php v7 APCu cache API

* github.com:phpbb/phpbb:
  [PHPBB3-15247] Add support for php v7 APCu cache API

phpBB/phpbb/cache/driver/apcu.php

@@ -0,0 +1,70 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\cache\driver;
+
+/**
+* ACM for APCU
+*/
+class apcu extends \phpbb\cache\driver\memory
+{
+	var $extension = 'apcu';
+
+	/**
+	* {@inheritDoc}
+	*/
+	function purge()
+	{
+		apcu_clear_cache();
+
+		parent::purge();
+	}
+
+	/**
+	* Fetch an item from the cache
+	*
+	* @access protected
+	* @param string $var Cache key
+	* @return mixed Cached data
+	*/
+	function _read($var)
+	{
+		return apcu_fetch($this->key_prefix . $var);
+	}
+
+	/**
+	* Store data in the cache
+	*
+	* @access protected
+	* @param string $var Cache key
+	* @param mixed $data Data to store
+	* @param int $ttl Time-to-live of cached data
+	* @return bool True if the operation succeeded
+	*/
+	function _write($var, $data, $ttl = 2592000)
+	{
+		return apcu_store($this->key_prefix . $var, $data, $ttl);
+	}
+
+	/**
+	* Remove an item from the cache
+	*
+	* @access protected
+	* @param string $var Cache key
+	* @return bool True if the operation succeeded
+	*/
+	function _delete($var)
+	{
+		return apcu_delete($this->key_prefix . $var);
+	}
+}