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