How to get link suffix in php

How to get the suffix (php) of the executed file my.order.php, 2 methods are listed for reference only:

First get it through parse_url Link information:

      
The running result is as follows:
      
Array ( [scheme] => http [host] => www.xxx.com [path] => /testweb/my.order.php [query] => abcd=111@qqq=222 )
      
Then get the file extension based on the obtained (path) information.
      
Method 1
      
Idea: Read the path information through pathinfo and the PATHINFO_EXTENSION parameter, and the output is the file extension.
      
echo pathinfo($parseUrl_link['path'],PATHINFO_EXTENSION );
      
Method 2
      
Idea: Get the information including the last "." and the following through strrchr, and then delete the "." on the left. , the output is the file extension.
      
echo ltrim(strrchr($parseUrl_link['path'],"."),".");
      
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