js和php如何获取当前url的内容

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

//获取域名或主机地址 
echo $_SERVER['HTTP_HOST']."<br>"; #localhost //获取网页地址 
echo $_SERVER['PHP_SELF']."<br>"; #/blog/testurl.php 
//获取网址参数 
echo $_SERVER["QUERY_STRING"]."<br>"; #id=5 
//获取用户代理 
echo $_SERVER['HTTP_REFERER']."<br>"; 
//获取完整的url 
echo 'http://'.$_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

javascript实现：

top.location.href 顶级窗口的地址 
this.location.href 当前窗口的地址