php如何获取当前页面url路径

#测试网址: http://localhost/blog/testurl.php?id=5
//获取域名或主机地址
echo $_server['http_host']."
"; #localhost
//获取网页地址
echo $_server['php_self']."
"; #/blog/testurl.php
//获取网址参数
echo $_server["query_string"嫌乎悔]."
"; #id=5
//顷谨获取用户代理
echo $_server['http_referer']."
";
//获取完整的url
echo 'http://'.$_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
/芹正/只取路径
$url='http://'.$_server['server_name'].$_server["request_uri"];
echo dirname($url);
#http://localhost/blog