PHP概率抽奖

说明

大多数活动或游戏都会有转盘等抽奖活动，以下方法实现简单的生成转盘奖品

逻辑代码

//最后确认相加等于100
$prize = array(
    1 => 3.5, //3.5%机率
    2 => 2.5, 
    3 => 6, 
    4 => 2, 
    5 => 42, //42%机率
    6 => 36, 
    7 => 2, 
    8 => 4, 
    9 => 2
);
// 奖品
$prizeList = array(
    1 => array('长江七号'), 
    2 => array('3Q币'), 
    3 => array('10000游戏币'), 
    4 => array('99999游戏币'), 
    5 => array('谢谢参与!'), 
    6 => array('欢迎下次再来！'), 
    7 => array('10Q币'), 
    8 => array('洗衣液'), 
    9 => array('纸巾一条')
);
// unset($prize[7]); //直接把10Q这个奖品去掉
$times = 10;
$max = 0;
foreach ($prize as $k => $v) {
    $max = $v * $times + $max;
    $row['v'] = $max;
    $row['k'] = $k;
    $prizeZone[] = $row;
}
$max--; //临界值
$rand = mt_rand(0, $max);
$zone = 1;
foreach ($prizeZone as $k => $v) {
    if ($rand >= $v['v']) {
        if ($rand >= $prizeZone[$k + 1]['v']) {
            continue;
        } else {
            $zone = $prizeZone[$k + 1]['k'];
            break;
        }
    }
    $zone = $v['k'];
    break;
}
print_r($prizeList[$zone][0])

结果：谢谢参与!