PHP中获取当前页面完整的url

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']."

"; #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