代码笔记 | 微信红包算法

/**生成红包的函数*/
function getRandMoney($totalMoney, $totalPeople=2, $miniMoney=1){

$randRemainMoney = $totalMoney - $totalPeople * $miniMoney;//剩余需要随机的钱数
return _getRandMoney($randRemainMoney, $totalPeople, $miniMoney);
}

/**红包生成的逻辑代码*/
function _getRandMoney($totalMoney, $totalPeople, $miniMoney){

$returnMessage = array('status'=>1, 'data'=>NULL);
if($totalMoney > 0){
$returnMessage['data'] = _randMoney($totalMoney, $totalPeople, $miniMoney);
}elseif($totalMoney == 0){
$returnMessage['data'] = array_fill(0, $totalPeople, 1);
}else{
$returnMessage['status'] = -1;
$returnMessage['data'] = '参数传递有误，生成红包失败';
}

return $returnMessage;
}

/*参数无误，开始生成对应的红包金额*/
function _randMoney($totalMoney, $totalPeople, $miniMoney){

$data = array_fill(0, $totalPeople, $miniMoney);
if($totalPeople > 1){
foreach($data as $k => $v){
if($k == $totalPeople -1){
$data[$k] = $totalMoney + $v;
break;
}else {
if($totalMoney == 0) break;
$randMoney = rand(0, $totalMoney);
$totalMoney -= $randMoney;
$data[$k] = $randMoney + $v;
}
}
}
return $data;
}