Online PHP editor | refs for smTqT

<?php $filenames = [ 'abc(3).jpg', 'xyz.pdf' ]; foreach ($filenames as $filename) { echo preg_replace_callback('/(?:$(\d+)$)?(\.[^.]+$)/', function($matches) { $version = empty($matches[1]) ? 0 : $matches[1]; return '(' . ($version + 1) . ')' . $matches[2]; }, $filename); echo "\n"; }