Analysis of WeChat red envelope algorithm implemented in PHP (unofficial)

Analysis of WeChat red envelope algorithm implemented in PHP (unofficial)_php skills

WBOY

Release： 2016-05-16 20:07:32

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The example in this article describes the WeChat red envelope algorithm implemented in PHP. Share it with everyone for your reference. The details are as follows:

I have been experiencing the red envelope function in the WeChat group recently. There are two types of red envelopes:

1. Ordinary red envelope

2. Win lucky red envelopes

No need to analyze the ordinary red envelopes. The principle of rice in the same pot is to divide them equally.

The lucky red envelope is about luck (luck). Some people can grab a lot, and some people can grab a pitiful little. Of course, it doesn’t mean that you will get more if you grab it first. In the final analysis, it is random.

I thought about it and wrote it myself to see if I can achieve similar functions (I dare not say it is an algorithm).

// $bonus_total 红包总金额
// $bonus_count 红包个数
// $bonus_type 红包类型 1=拼手气红包 0=普通红包
function randBonus($bonus_total=0, $bonus_count=3, $bonus_type=1){
  $bonus_items  = array(); // 将要瓜分的结果
  $bonus_balance = $bonus_total; // 每次分完之后的余额
  $bonus_avg   = number_format($bonus_total/$bonus_count, 2); // 平均每个红包多少钱
  $i       = 0;
  while($i<$bonus_count){
    if($i<$bonus_count-1){
      $rand      = $bonus_type&#63;(rand(1, $bonus_balance*100-1)/100):$bonus_avg; // 根据红包类型计算当前红包的金额
      $bonus_items[] = $rand;
      $bonus_balance -= $rand;
    }else{
      $bonus_items[] = $bonus_balance; // 最后一个红包直接承包最后所有的金额，保证发出的总金额正确
    }
    $i++;
  }
  return $bonus_items;
}

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Okay, let’s experience it now

// 发3个拼手气红包，总金额是100元
$bonus_items  = randBonus(100, 3, 1);
// 查看生成的红包
var_dump($bonus_items);
// 校验总金额是不是正确，看看微信有没有坑我们的钱
var_dump(array_sum($bonus_items));

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Another version implemented using arrays, the principle is similar:

function sendRandBonus($total=0, $count=3, $type=1){
  if($type==1){
    $input     = range(0.01, $total, 0.01);
    if($count>1){
      $rand_keys = (array) array_rand($input, $count-1);
      $last    = 0;
      foreach($rand_keys as $i=>$key){
        $current  = $input[$key]-$last;
        $items[]  = $current;
        $last    = $input[$key];
      }
    }
    $items[]    = $total-array_sum($items);
  }else{
    $avg      = number_format($total/$count, 2);
    $i       = 0;
    while($i<$count){
      $items[]  = $i<$count-1&#63;$avg:($total-array_sum($items));
      $i++;
    }
  }
  return $items;
}

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I hope this article will be helpful to everyone’s PHP programming design.