PHP获取当前页面的url

//获取域名或主机地址 
echo $_SERVER['HTTP_HOST']."<br>";#localhost 
//获取网页网址 
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);

原文：https://blog.csdn.net/qq_40018938/article/details/80072895