PHP 获取当前的网址的信息

从aaa.html这里进去

<a href="demo.php?f=onestopweb">test</a>

demo.php 列出关于当前网址的信息

<meta charset="utf-8">
<?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'].$_SERVER['REQUEST_URI']."<br />";
echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING']."<br />";
//包含端口号的完整url
echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"]."<br />";
//只取路径
$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"];
echo dirname($url)."<br />";
if($_SERVER['HTTP_HOST']=="localhost"){
	echo "通过";
}
?>

效果图：