<?php
$url = "http://blog.youkuaiyun.com/ztlove9481731";
echo urlencode($url); //输出编码后的字符串
?>
<?php
$url = "http%3A%2F%2Fblog.youkuaiyun.com%2Fztlove9481731";
$newurl = urlencode($url); //首先对$url进行编码
echo urldecode($newurl); //输出解码后的字符串
?>