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PHP奖池进行随机分配用户，设置最小单位

/**
 * 奖池进行随机分配用户，设置最小单位
 * @param $total_num 总奖池数
 * @param $ids 用户ID 数组
 * @param $multiple 最小单位
 * @return array 
 */
function random_split($total_num,$ids,$multiple){
    $total_num = $total_num / $multiple;
    $total_copies = count($ids);
    $result = []; //结果
    for($i=$total_copies;$i>0;$i--){
        $ls_num=0;
        $num = 0;
        if($total_num > 0){
            if($i==1){
                $num += $total_num;
            }else{
                $max_num = floor($total_num/$i);
                $ls_num = mt_rand(1,$max_num);
                $num += $ls_num;
            }
        }
        $result[] = ['user_id'=>$ids[$i-1],'divide_heat'=>$num*$multiple];
        $total_num -= $ls_num;
    }
    shuffle($result); //打乱数组
    return $result; //返回数组
}
//调用结果：
//总奖池数
$total_num = 150000;
//用户组
$ids = [11,15,20,119,50];
//最小单位1000
$multiple = 1000;
$resault = random_split($total_num,$ids,$multiple);
print_r($resault);
Array
(
    [0] => Array
        (
            [user_id] => 119
            [divide_heat] => 19000
        )
    [1] => Array
        (
            [user_id] => 15
            [divide_heat] => 2000
        )
    [2] => Array
        (
            [user_id] => 11
            [divide_heat] => 107000
        )
    [3] => Array
        (
            [user_id] => 50
            [divide_heat] => 13000
        )
    [4] => Array
        (
            [user_id] => 20
            [divide_heat] => 9000
        )
)