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WeChat red envelope random generation algorithm php version_php example
WeChat red envelope random generation algorithm php version_php example
I thought about it for a while and asked if I could write a PHP version of the WeChat red envelope random generation algorithm to achieve similar functions (actually I dare not say it is an algorithm).
// $bonus_total Total amount of red envelope
// $bonus_count Number of red envelopes
// $bonus_type Red envelope type 1=lucky red envelope 0=ordinary red envelope
function randBonus($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;
}
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($bonus_items));
Another version implemented using arrays, the principle is similar:
function sendRandBonus($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?$avg:($total-array_sum($items));
$i++;
}
}
return $items;
}The above is the entire content of this article. I hope it will be helpful to everyone’s study. I also hope that everyone will support Script Home.
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