PHP中获取当前页面的完整URL

#测试网址:     http://localhost/blog/testurl.php?id=五

//获与域名或者主机天址 
echo $_SERVER['HTTP_HOST']."<br>"; #localhost

//获与网页天址 
echo $_SERVER['PHP_SELF']."<br>"; #/blog/testurl.php

//获与网址参数 
echo $_SERVER["QUERY_STRING"]."<br>"; #id=五

//获与用户代办署理 
echo $_SERVER['HTTP_REFERER']."<br>"; 

//获与完全的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=五

//包括端心号的完全url
echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"]; 
#http://localhost:八0/blog/testurl.php?id=五

//只与途径
$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"]; 
echo dirname($url);
#http://localhost/blog