获取域名或主机地址
echo $_SERVER['HTTP_HOST']."<br>"; #localhost
获取网页地址
echo $_SERVER['PHP_SELF']."<br>"; #/blog/testurl.php
获取网址参数
echo $_SERVER["QUERY_STRING"]."<br>"; #id=5
获取用户dai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'];
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);