How does php obtain the file extension? Php file extension methods

How does php obtain the file extension? Php file extension methods

How to obtain the file extension in php, how to obtain the file extension in php, and how to obtain the file extension in php through examples. The example is relatively simple and suitable for reference in the php Getting Started Tutorial. How does php obtain the file extension? What are the methods? 1. example of a simple php file extension: Sample code: 2. three methods for obtaining file extensions in php Example: Sample code: // Method 2 function extend_2 ($ file_name) {$ extend = pathinfo ($ file_name); $ extend = strtolower ($ extend ["extension"]); return $ extend ;} // Method 3 function extend_3 ($ file_name) {$ extend = explode (". ", $ file_name); $ va = count ($ extend)-1; return $ extend [$ va] ;}?>