php获取当前url

//http://127.0.0.1/test/aa.php?id=1

//获取域名或主机地址 

echo $_SERVER['HTTP_HOST'];//localhost

//获取网页地址 

echo $_SERVER['PHP_SELF'];//test/aa.php

//获取参数 

echo $_SERVER["QUERY_STRING"]; //id=1

//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://127.0.0.1/test/aa.php?id=1

//包含端口号的完整url

echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"]; 

//获取路径

$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"]; 
echo dirname($url);
# http://127.0.0.1/test