How to get the current domain name in PHP

This article mainly introduces how to obtain the current domain name in PHP. Friends in need can refer to it

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<?  
//获取当前的域名:  
echo $_SERVER[&#39;SERVER_NAME&#39;];  
//获取来源网址,即点击来到本页的上页网址  
echo $_SERVER["HTTP_REFERER"];  
$_SERVER[&#39;REQUEST_URI&#39;];//获取当前域名的后缀  
$_SERVER[&#39;HTTP_HOST&#39;];//获取当前域名  
dirname(__FILE__);//获取当前文件的物理路径  
dirname(__FILE__)."/../";//获取当前文件的上一级物理路径  
?>

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