PHP 简单的抽奖实现算法

    public function choujiang()
    {
        // 奖品数组
        $proArr = [
            ['id' => 1, 'name' => '特等奖', 'v' => 1],
            ['id' => 2, 'name' => '一等奖', 'v' => 4],
            ['id' => 3, 'name' => '二等奖', 'v' => 5],
            ['id' => 4, 'name' => '三等奖', 'v' => 10],
            ['id' => 5, 'name' => '四等奖', 'v' => 30],
            ['id' => 6, 'name' => '谢谢惠顾', 'v' => 50],
        ];
        dump($this->get_rand($proArr));
    }
    private function get_rand($proArr)
    {
        $result = array();
        foreach ($proArr as $key => $val) {
            $arr[$key] = $val['v'];
        }
        dump("抽奖概率");
        dump($arr);
        // 概率数组的总概率
        $proSum = array_sum($arr);
        asort($arr);
        // 概率数组循环
        foreach ($arr as $k => $v) {
            $randNum = mt_rand(1, $proSum);
            if ($randNum <= $v) {
                $result = $proArr[$k];
                break;
            } else {
                $proSum -= $v;
            }
        }
        return $result;
    }