// $bonus_total 紅包總金額
// $bonus_count 紅包個數(shù)
// $bonus_type 紅包類型 1=拼手氣紅包 0=普通紅包
function randBonus($bonus_total=0, $bonus_count=3, $bonus_type=1){
  $bonus_items  = array(); // 將要瓜分的結(jié)果
  $bonus_balance = $bonus_total; // 每次分完之后的余額
  $bonus_avg   = number_format($bonus_total/$bonus_count, 2); // 平均每個紅包多少錢
  $i       = 0;
  while($i<$bonus_count){
    if($i<$bonus_count-1){
      $rand      = $bonus_type?(rand(1, $bonus_balance*100-1)/100):$bonus_avg; // 根據(jù)紅包類型計算當(dāng)前紅包的金額
      $bonus_items[] = $rand;
      $bonus_balance -= $rand;
    }else{
      $bonus_items[] = $bonus_balance; // 最后一個紅包直接承包最后所有的金額，保證發(fā)出的總金額正確
    }
    $i++;
  }
  return $bonus_items;
}

// 發(fā)3個拼手氣紅包，總金額是100元
$bonus_items  = randBonus(100, 3, 1);
// 查看生成的紅包
var_dump($bonus_items);
// 校驗總金額是不是正確，看看微信有沒有坑我們的錢
var_dump(array_sum($bonus_items));

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?$avg:($total-array_sum($items));
      $i++;
    }
  }
  return $items;
}