php抽奖算法
奖品设置
$award = [{id: "1", award: "幸运值+5", probability: "48", quantity: "0"},
{id: "2", award: "幸运值+1", probability: "50", quantity: "0"},
{id: "3", award: "iPad pro", probability: "0", quantity: "0"},
{id: "4", award: "联想笔记本电脑", probability: "0", quantity: "0"}]
根据概率随机抽奖项
/**
* 抽奖逻辑
*/
private function randPrize($award)
{
$result = array();
foreach ($award as $key => $val) {
// 1.每个抽奖项的获取概率
$arr[$key] = $val['probability'];
}
// 2.计算总概率
$proSum = array_sum($arr);
// 3.重排概率
asort($arr);
// 4.概率数组循环
foreach ($arr as $k => $v) {
$randNum = mt_rand(1, $proSum);
if ($randNum <= $v) {
$result = $award[$k];
break;
} else {
$proSum -= $v;
}
}
return $result['id'];
}
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