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

Once you have the filename in a string, first use regex to replace the extension with an extension of your choice. Here's a small function that'll do that:

function replace_extension($filename, $new_extension) {
    return preg_replace('/\..+$/', '.' . $new_extension, $filename);
}

Then use the rename() function to rename the file with the new filename.