PHP 在线 编辑 解析

http://www.imooc.com/code/601    

http://www.w3schools.com/php/default.asp  

http://www.w3schools.com/php/showphp.asp?filename=demo_syntax

http://phpfiddle.org/

http://www.compileonline.com/execute_php_online.php

http://writecodeonline.com/php/