Getting file extension can allow us to apply different operation by file extension. For example, you should set different http header by image extension. In this tutorial, we will write a simple example to show you how to get file extension easily by using php.
Define a file
<?php $filename = "image.png"; ?>
Get file extension
$extension = pathinfo($filename, PATHINFO_EXTENSION); echo $extension;
The output is: png
Notice: the file extension may be empty, if a file does not contain an extension.