How does PHP get the file extension? PHP get file extension three ways

PHP How to get the file extension, PHP to get the file extension of what skills, through the example of learning PHP to get file extension of several methods, examples are relatively simple, suitable as a guide for PHP tutorial reference. How does PHP get the file extension? What are the methods? First, PHP simple get file extension example: Copy Codecode example: Two, php get file extension three ways Example: Copy Codecode example: Method Two function Extend_2 ($file _name) {$extend = PathInfo ($file _name); $extend = Strtolower ($extend ["extension"]); return $extend; } Method Three function Extend_3 ($file _name) {$extend =explode (".", $file _name); $va =count ($extend)-1; return $extend [$va];} &G T

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