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@ 2015-11-17T10:29:10Z

<?php

function factorial($n) {
    if ($n) {
        return $n * fact($n-1);
    } else {
        return 1;
    }
}

var_dump(fact(0));

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

38.93 ms | 402 KiB | 5 Q