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php年终抽奖

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PHP中文网Original
2016-05-25 17:08:561370browse

1.抽奖

1.jpg

2.核心算法

function get_rand($proArr)
{
    $result = ''; //概率数组的总概率精度
    $proSum = array_sum($proArr); //概率数组循环
    foreach ($proArr as $key => $proCur) {
        $randNum = mt_rand(1, $proSum);
        if ($randNum <= $proCur) {
            $result = $key;
            break;
        } else {
            $proSum -= $proCur;
        }
    }
    unset($proArr);
    return $result;
}
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