PHP example code to implement lottery

This article mainly shares with you the example code of php to implement lottery. We first share the code algorithm with you, hoping to help you.

Algorithm:

<?php function get_rand($proArr) { 
    $result = &#39;&#39;; 

    //概率数组的总概率精度 
    $proSum = array_sum($proArr); //计算数组中元素的和

    //概率数组循环 
    foreach ($proArr as $key => $proCur) { 
        $randNum = mt_rand(1, $proSum); 
        if ($randNum <= $proCur) { //如果这个随机数小于等于数组中的一个元素，则返回数组的下标
            $result = $key; 
            break; 
        } else { 
            $proSum -= $proCur; 
        } 
    } 

    unset ($proArr); 

    return $result; 
}

Set prizes:

$prize_arr = array( 
    '0' => array('id'=>1,'prize'=>'平板电脑','v'=>1), 
    '1' => array('id'=>2,'prize'=>'数码相机','v'=>5), 
    '2' => array('id'=>3,'prize'=>'音箱设备','v'=>10), 
    '3' => array('id'=>4,'prize'=>'4G优盘','v'=>12), 
    '4' => array('id'=>5,'prize'=>'10Q币','v'=>22), 
    '5' => array('id'=>6,'prize'=>'下次没准就能中哦','v'=>50), 
);foreach ($prize_arr as $key => $val) { 
    $arr[$val['id']] = $val['v']; //将$prize_arr放入数组下标为$prize_arr的id元素，值为v元素的数组中} 

$rid = get_rand($arr); //根据概率获取奖项id $res[&#39;yes&#39;] = $prize_arr[$rid-1][&#39;prize&#39;]; //获取中奖项 unset($prize_arr[$rid-1]); //将中奖项从数组中剔除，剩下未中奖项 shuffle($prize_arr); //打乱数组顺序 for($i=0;$i<count($prize_arr);$i++){ 
    $pr[] = $prize_arr[$i][&#39;prize&#39;]; 
} 
$res[&#39;no&#39;] = $pr; 
echo json_encode($res);  

 ?>

The code can be run directly

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