Add suffix to a file name

Question

$config['file_name'] = preg_replace('/(\.gif|\.jpg|\.png)/', '_thumb$1', $filename);

Basically I want filename.jpg to become filename_thumb.jpg

I don't understand why but the extension is being repeated twice. (filename.jpg.jpg).

Edit This does work, I have other problems in my code.

Answer 1

Should work.

echo preg_replace('/(\.gif|\.jpg|\.png)/', '_thumb$1', "filename.jpg");

gives filename_thumb.jpg.

In any case, use the expression '/(\.gif|\.jpg|\.png)$/' instead (better, don't use parentheses and replace $1 with $0), so that it only matches the string if it's on the end.

Answer 2

The best way to do it would probably be...

$filename_ext = pathinfo($filename, PATHINFO_EXTENSION);

$filename = preg_replace('/^(.*)\.' . $filename_ext . '$/', '$1_thumb.' . $filename_ext, $filename);

I justed tested it, with $filename = 'path/to/something.jpg'; and the output was path/to/something_thumb.jpg.

I say the best way because generally using PHP's inbuilt functions are better. This also allows for all file extensions that PHP can handle (being string splitting, it should be all).