总结PHP如何获取当前主机、域名、网址、路径、端口和参数等

//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 $_SERVER['HTTP_REFERER']."<br />"; //获取完整的urlecho 'http://'.$_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urlecho '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);