php 获取当前页面url路径

 #测试网址:     http://localhost/blog/testurl.php?id=5

 //获取域名或主机地址

 echo $_SERVER['HTTP_HOST'].""; #localhost

 //获取网页地址

 echo $_SERVER['PHP_SELF'].""; #/blog/testurl.php

 //获取网址参数

 echo $_SERVER["QUERY_STRING"].""; #id=5

 //获取用户代理

 echo $_SERVER['HTTP_REFERER']."";

 //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