현재 URL 주소를 얻는 PHP 메소드

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

#测试网址:   http://localhost/blog/testurl.php?id=5
//获取域名或主机地址
echo $_SERVER[&#39;HTTP_HOST&#39;]."<br>"; #localhost
//获取网页地址
echo $_SERVER[&#39;PHP_SELF&#39;]."<br>"; #/blog/testurl.php
//获取网址参数
echo $_SERVER["QUERY_STRING"]."<br>"; #id=5
//获取用户代理
echo $_SERVER[&#39;HTTP_REFERER&#39;]."<br>";
//获取完整的url
echo &#39;http://&#39;.$_SERVER[&#39;HTTP_HOST&#39;].$_SERVER[&#39;REQUEST_URI&#39;];
echo &#39;http://&#39;.$_SERVER[&#39;HTTP_HOST&#39;].$_SERVER[&#39;PHP_SELF&#39;].&#39;?&#39;.$_SERVER[&#39;QUERY_STRING&#39;];
#http://localhost/blog/testurl.php?id=5
//包含端口号的完整url
echo &#39;http://&#39;.$_SERVER[&#39;SERVER_NAME&#39;].&#39;:&#39;.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
#http://localhost:80/blog/testurl.php?id=5
//只取路径
$url=&#39;http://&#39;.$_SERVER[&#39;SERVER_NAME&#39;].$_SERVER["REQUEST_URI"];
echo dirname($url);
#http://localhost/blog