Online PHP editor | vld for BBArn

<?php $files = [ 'BBBOF1_0090_A.jpg', 'BBBOF1_0090_B.jpg', 'BBBOF1_0090_C.jpg', 'BBDOTR_0070_A.jpg', 'BBDOTR_0070_B.jpg' ]; $replacers = [ array_map(fn($v) => '_'.$v, range('A', 'Z')), array_map(fn($v) => '_'.$v, range(1, 26)) ]; foreach ($files as $file) { echo 'K'.str_replace($replacers[0], $replacers[1], $file).PHP_EOL; }