optional cache prefix for multiple tinyboard instances on one machine

inc/cache.php

@@ -17,6 +17,8 @@
 		public static function get($key) {
 			global $config, $debug;
 			
+			$key = $config['cache']['prefix'] . $key;
+			
 			$data = false;
 			switch($config['cache']['enabled']) {
 				case 'memcached':
@@ -45,6 +47,8 @@
 		public static function set($key, $value, $expires = false) {
 			global $config;
 			
+			$key = $config['cache']['prefix'] . $key;
+			
 			if(!$expires)
 				$expires = $config['cache']['timeout'];
 			
@@ -68,6 +72,8 @@
 		public static function delete($key) {
 			global $config;
 			
+			$key = $config['cache']['prefix'] . $key;
+			
 			switch($config['cache']['enabled']) {
 				case 'memcached':
 					if(!self::$cache)

inc/config.php

@@ -120,6 +120,9 @@
  	// Timeout for cached objects such as posts and HTML
 	$config['cache']['timeout'] = 43200; // 12 hours
 	
+	// Optional prefix if you're running multiple Tinyboard instances on the same machine
+	$config['cache']['prefix'] = '';
+	
 	// Memcached servers to use - http://www.php.net/manual/en/memcached.addservers.php
 	$config['cache']['memcached'] = Array(
 		Array('localhost', 11211)