gistfile1.txt

<?php

$data = scandir(__DIR__);

foreach ($data as $sub) {
    if (is_dir(__DIR__ . DIRECTORY_SEPARATOR . $sub)) {
        echo $sub . ' is a dir';

        if (preg_match('/[0-9]{3}/', $sub)) {
            echo ' and is a bank code';
        }
        echo PHP_EOL;
    }
}