php获取当前域名、主机、URL、端口、参数、网址、路径、代理等

<?PHP

//获取域名或主机地址

echo $_SERVER['HTTP_HOST']."<br />";

//获取网页地址

echo $_SERVER['PHP_SELF']."<br />";

//获取网址参数

echo $_SERVER["QUERY_STRING"]."<br />";

//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'];

//包含端口号的完整url

echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];

//只取路径

$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"];

echo dirname($url);

?>