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

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).

Answer 2

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.