php获取当前域名、主机、URL、端口、参数、网址、路径、代理等[转]

获取域名或主机地址

echo $_SERVER['HTTP_HOST']."
";

获取网页地址

echo $_SERVER['PHP_SELF']."
";

获取网址参数

echo $_SERVER["QUERY_STRING"]."
";

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'];

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);