<?php
/**
* javascript实现：
* top.location.href 顶级窗口的地址
* this.location.href 当前窗口的地址
*/
//PHP实现
//测试网址: http://localhost/blog/testurl.php?id=5
//获取域名或主机地址
echo $_SERVER['HTTP_HOST']."<br>"; # localhost
//获取网页地址
echo $_SERVER['PHP_SELF']."<br>"; # /blog/testurl.php
//获取网址参数
echo $_SERVER["QUERY_STRING"]."<br>"; # id=5
//获取用户代理
echo $_SERVER['HTTP_REFERER']."<br>";
//获取完整的url
echo 'http://'.$_SERVER['HTTP_HOST']. $_SERVER['REQUEST_URI'];
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER ['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];
#http://localhost/blog/testurl.php?id=5
//包含端口号的完整url
echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER ["SERVER_PORT"].$_SERVER["REQUEST_URI"];
#http://localhost:80/blog/testurl.php?id=5
//只取路径
$url ='http://'.$_SERVER['SERVER_NAME']. $_SERVER["REQUEST_URI"];
echo dirname ($url);
#http://localhost/blog
