PHP implements red envelope function code

This article mainly shares with you the red envelope function implemented in php, mainly in the form of code. Since I am the first to write red envelopes and don’t know much about red envelopes, I hope it can help everyone.

for ($i=1; $i < $p; ++$i) { 
	$s2 = ($sum - ($p - $i) * 0.01)/($p - $i);  
	//echo $s2;die;
    $money = rand(1,$s2*100);
    $money = number_format($money/100,2,&#39;.&#39;,&#39;,&#39;); 
	$sum = $sum - $money;
	$wamp[$i] = $money;
	
}
   //format_number(要转换的浮点数,要分隔的符号)
   echo "<hr/>";
   echo "<pre class="brush:php;toolbar:false">";
    print_r($wamp);
    echo "<pre class="brush:php;toolbar:false">";


}
//echo 2;

The red envelope function can be basically realized and the main thoughts are discussed

There is a scenario where there are 50 students in a classmate group who want to give out red envelopes to celebrate the party

First of all, everyone must receive it Receive a red envelope and the probability of everyone receiving a red envelope is basically the same

Then the probability of everyone receiving a red envelope = (The current amount of the red envelope - (The number of people who have not received the red envelope currently) * The minimum amount of red envelopes received by each person) / The current number of people who have not received a red envelope

$safe_total The probability of each person receiving a red envelope $total The current amount of red envelopes $min The minimum amount of red envelopes for each person

Then the formula can be $safe_total = ($total - ($num - $i) * $min) / ($num - $i);

The code is not unique, the important thing is the thought

The following is the reference code

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 - $i); //红包金额的最大值    为了是大部分个人获得的红包金额一定
if ($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[&#39;MoneySum&#39;] = $wamp;
$returnData[&#39;newTotal&#39;] = array_sum($wamp);
return $returnData;
}
//测试
$data = getRedGift(100, 10);
echo "<pre class="brush:php;toolbar:false">";


print_r($data);


echo "<pre class="brush:php;toolbar:false">";

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