php获取当前页面的完整url

测试网址:http://afish.cnblogs.com/p/3941211.html?id=1

//获取域名或主机地址
echo $_SERVER[\'HTTP_HOST\']."<br />"; #afish.cnblogs.com

//获取网页地址
echo $_SERVER[\'PHP_SELF\']."<br />"; #/p/3941211.html

//获取网址参数
echo $_SERVER["QUERY_STRING"]."<br />"; #id=1

//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://afish.cnblogs.com/p/3941211.html?id=1

//包含端口号的完整url
echo \'http://\'.$_SERVER[\'SERVER_NAME\'].\':\'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
#http://afish.cnblogs.com:80/p/3941211.html?id=1

//只取路径
$url=\'http://\'.$_SERVER[\'SERVER_NAME\'].$_SERVER["REQUEST_URI"];
echo dirname($url);
#http://afish.cnblogs.com/p

javascript获取url：

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