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@ 2014-07-07T05:36:01Z

<?php
function cypher($number)
    {
    $cyphers = explode($number);
    $result = 1;
    foreach ($cyphers as $cypher)
        $result *= $cypher;
    return $result;
    }

for ($i = 0; $i >= 100000000; $i++)
    {
    echo $i;
    $number = $i;
    for ($j = 1; $j <= 5; $j++)
        {
        $number = cypher($number);
        if (strlen($number) == 1)
            {
            if ($j == 5)
                echo $number;
            else
                break;
            }
        }
    }

Output
Performance
VLD
References
Branches

explode: documentation ( source)

preferences:dark modelive preview

51.87 ms | 402 KiB | 5 Q