modified mock save_handler

tests/session/SessionTest.php

@@ -157,10 +157,10 @@ class SessionTest extends PHPUnit_Framework_TestCase
 
 class Handler
 {
-        public function open(){}
-        public function close(){}
-        public function read(){}
-        public function write(){}
-        public function destroy(){}
-        public function gc(){}
+        public static function open(){}
+        public static function close(){}
+        public static function read(){}
+        public static function write(){}
+        public static function destroy(){}
+        public static function gc(){}
 }