* new cache engine: plain php

TODO

@@ -84,7 +84,6 @@ x.x - At any time between (version not specified)
 	* update account.management page to be more realistic (like on tibia.com)
 	* update guilds page to be more realistic (like on tibia.com)
 	* possibility to add extra cache engines with plugins
-		* new cache engine - plain php, is good with pure php 7.0+ and opcache
 	* preferably configurable (enable/disable) forum TinyMCE editor
 	* OTAdmin support in Admin Panel
 	* database towns table support for TFS 1.3

system/libs/cache.php

@@ -64,6 +64,11 @@ class Cache
 				self::$instance = new Cache_File($prefix, CACHE);
 				break;
 
+			case 'php':
+				require 'cache_php.php';
+				self::$instance = new Cache_PHP($prefix, CACHE);
+				break;
+
 			case 'auto':
 				self::$instance = self::generateInstance(self::detect(), $prefix);
 				break;

system/libs/cache_php.php

@@ -0,0 +1,77 @@
+<?php
+/**
+ * PHP cache class
+ *
+ * @package   MyAAC
+ * @author    Slawkens <slawkens@gmail.com>
+ * @copyright 2017 MyAAC
+ * @link      http://my-aac.org
+ */
+defined('MYAAC') or die('Direct access not allowed!');
+
+class Cache_PHP
+{
+	private $prefix;
+	private $dir;
+	private $enabled;
+
+	public function __construct($prefix = '', $dir = '') {
+		$this->prefix = $prefix;
+		$this->dir = $dir;
+		$this->enabled = (file_exists($this->dir) && is_dir($this->dir) && is_writable($this->dir));
+	}
+
+	public function set($key, $var, $ttl = 0)
+	{
+		$var = var_export($var, true);
+
+		// Write to temp file first to ensure atomicity
+		$tmp = $this->dir . "tmp_$key." . uniqid('', true) . '.tmp';
+		file_put_contents($tmp, '<?php $var = ' . $var . ';', LOCK_EX);
+
+		$file = $this->_name($key);
+		rename($tmp, $file);
+		if($ttl !== 0) {
+			touch($file, time() + $ttl);
+		}
+		else {
+			touch($file, time() + 24 * 60 * 60);
+		}
+	}
+
+	public function get($key)
+	{
+		$tmp = '';
+		if($this->fetch($key, $tmp))
+			return $tmp;
+
+		return '';
+	}
+
+	public function fetch($key, &$var)
+	{
+		$file = $this->_name($key);
+		if(!file_exists($file) || filemtime($file) < time())
+			return false;
+
+		@include $file;
+		$var = isset($var) ? $var : null;
+		return true;
+	}
+
+	public function delete($key)
+	{
+		$file = $this->_name($key);
+		if(file_exists($file))
+			unlink($file);
+	}
+
+	public function enabled() {
+		return $this->enabled;
+	}
+
+	private function _name($key) {
+		return sprintf('%s%s%s', $this->dir, $this->prefix, sha1($key) . '.php');
+	}
+}
+?>