微信红包随机生成算法php版

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?(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;}

// 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));

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;}