抽奖的算法也是比较简单分享两种的吧
1、只要是随机的数在当前的范围内就是中奖,设置奖品不是10000的话不会中奖,自己使用的抽奖代码逻辑
// 从1-10000中随机抽取一个数
$randomProbability = random_int(1, 10000);
$currentProbability = 0;
// $award 抽中的奖品信息
$award = [];
foreach ($realPrizes as $realPrize) {
$currentProbability += $realPrize['probability'];
if ($randomProbability <= $currentProbability) {
$award = $realPrize;
break;
}
}
2、百度比较多的,所有奖品中奖概率是总概率
<?php
public function gl(){
$prize_arr = [
'0' => ['id' => 1, 'prize' => '奖品1', 'v' => 20],
'1' => ['id' => 2, 'prize' => '奖品2', 'v' => 10],
'2' => ['id' => 3, 'prize' => '奖品3', 'v' => 20],
'3' => ['id' => 4, 'prize' => '奖品4', 'v' => 5],
'4' => ['id' => 5, 'prize' => '奖品5', 'v' => 19],
'5' => ['id' => 6, 'prize' => '奖品6', 'v' => 5],
'6' => ['id' => 7, 'prize' => '奖品7', 'v' => 10],
'7' => ['id' => 8, 'prize' => '奖品8', 'v' => 10],
];
foreach ($prize_arr as $key => $val) {
$arr[$val['id']] = $val['v'];
}
$rid = $this->get_prize($arr); //根据概率获取奖项id
$data = $prize_arr[$rid-1];
return json($data);
}
public function get_prize($proArr) {
$result = '';
//概率数组的总概率精度
$proSum = array_sum($proArr);
//概率数组循环
foreach ($proArr as $key => $proCur) {
$randNum = mt_rand(1, $proSum);
if ($randNum <= $proCur) {
$result = $key;
break;
} else {
$proSum -= $proCur;
}
}
unset ($proArr);
return $result;
}
?>
简单的抽奖算法的分享,后面有其他的也会分享一下
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