PHP中獲取當前頁面的完整URL

    #測試網址:     http://localhost/blog/testurl.php?id=5


//獲取域名或主機地址   
echo $_SERVER['HTTP_HOST']."<br>"; #localhost  

//獲取網頁地址   
echo $_SERVER['PHP_SELF']."<br>"; #/blog/testurl.php  

//獲取網址參數   
echo $_SERVER["QUERY_STRING"]."<br>"; #id=5  

//獲取用戶代理   
echo $_SERVER['HTTP_REFERER']."<br>";   

//獲取完整的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  

//包含端口號的完整url  
echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];   
#http://localhost:80/blog/testurl.php?id=5  

//只取路徑  
$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"];   
echo dirname($url);  
#http://localhost/blog  </pre>