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

Just replace it with regexp:

$filename = preg_replace('"\.bmp$"', '.jpg', $filename);

You can also extend this code to remove other image extensions, not just bmp:

$filename = preg_replace('"\.(bmp|gif)$"', '.jpg', $filename);