How to get a file extension in PHP?

To get the extension of a file in PHP, you can use the pathinfo function. This function returns an associative array containing information about the path, including the extension.

Here’s an example of how you can use it:

$path = '/path/to/file.txt';
$info = pathinfo($path);
echo $info['extension'];  // Outputs: txt

Alternatively, you can also use the substr function to extract the extension from the file name:

$path = '/path/to/file.txt';
$extension = substr($path, strrpos($path, '.') + 1);
echo $extension;  // Outputs: txt

Note that the pathinfo function is more reliable, as it handles cases where the file name may contain multiple dots (e.g., file.tar.gz). The substr method will only return the last part after the last dot, which may not always be the correct extension.