废话不多说了,一切解释尽在代码中,具体代码如下所示:
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/**
* @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
)*/
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