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<?php

declare(strict_types=1);

function paponacci(int $final): \Iterator {
    for ($i = 0; $i <= $final; $i++) {
        $isPapalNumber = true;
        $digits = str_split((string)$i);
        
        foreach($digits as $digit) {
            if(strpos((string)$final, $digit) === false) {
                $isPapalNumber = false;
                continue;
            }
        }
        
        if($isPapalNumber) {
            yield $i;
        }
    }
}

$generator = paponacci(2137);
foreach ($generator as $value) {
    echo "$value" . PHP_EOL;
}