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”].”
“; #id=5

//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

//只取路径
$url=’http://’.$_SERVER[‘SERVER_NAME’].$_SERVER[“REQUEST_URI”];
echo dirname($url);

http://localhost/blog