How can I change a file's extension using PHP?

Question

How can I change a file's extension using PHP?

Ex: photo.jpg to photo.exe

Answer 1

In modern operating systems, filenames very well might contain periods long before the file extension, for instance:

my.file.name.jpg 

PHP provides a way to find the filename without the extension that takes this into account, then just add the new extension:

function replace_extension($filename, $new_extension) {     $info = pathinfo($filename);     return $info['filename'] . '.' . $new_extension; }