生成微信红包
/**
* @param $total [你要发的红包总额]
* @param int $num [发几个]
* @return array[生成红包金额]
*/
function getRedGift($total, $num = 10)
{
$min = 0.01;
$wamp = array();
$returnData = array();
for ($i = 1; $i < $num; ++$i) {
$safe_total = ($total - ($num - $i) * $min) / ($num - $i); //红包金额的最大值
if ($safe_total < 0) break;
$money = @mt_rand($min * 100, $safe_total * 100) / 100;//随机产生一个红包金额
$total = $total - $money;//剩余红包总额
$wamp[$i] = round($money, 2);//保留两位有效数字
}
$wamp[$i] = round($total, 2);
$returnData['MoneySum'] = $wamp;
$returnData['newTotal'] = array_sum($wamp);
return $returnData;
}
//测试
$data = getRedGift(100, 10);
print_r($data);
//result:
/*
Array
(
[1] => 8.7
[2] => 10.09
[3] => 6.23
[4] => 6.87
[5] => 0.47
[6] => 3.12
[7] => 7.52
[8] => 12.21
[9] => 20.53
[10] => 24.26
)*/ 
