php--阶乘

function getNum($n){
    //获取1-100的阶乘
    $res = 1;

    for ($i=1;$i<=$n;$i++){

        $res *= $i;

    }

    return $res;
}

print getNum(4);

转载于:https://www.cnblogs.com/caoql/p/8709129.html