How to get the current domain name in PHP

This article mainly shares with you the method of obtaining the current domain name in PHP. It mainly shares with you a small piece of code. I hope it can help you.

1. <?  
   //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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