生成给定概率的随机对象 - php版

<?php
// 生成给定概率的随机对象 - php版
// $a = array('一等奖：宝马X6', '二等奖：苹果三件套', '三等奖：威戈背包', '继续努力！');
// $b = array(1,0,1,0);
// $re = goodluck($a,$b);

function goodluck($obj,$luck){
    $sum = 0;
    $factor = 0;
    
    // 计算sum
    foreach ($luck as $k => $v) {
        $sum = $sum + (int)$v;
    }

    // 获取一个随机数
    if($sum == 0){$min = $max = 0;}
    else if($sum == 1){$min = $max = 1;}
    else{$min = 1;$max =$sum;}

    $random = mt_rand($min,$max);

    foreach ($luck as $k => $v) {
        $factor = $factor + (int)$v;
        // 如果获取的这个随机数
        if($random <= $factor){
            return $obj[$k];
        }
    }
}