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Detailed explanation of php WeChat red envelope random generation algorithm
Detailed explanation of php WeChat red envelope random generation algorithm
This article mainly introduces the PHP version of WeChat red envelope random generation algorithm in detail. It has a certain reference value. Interested friends can refer to it.
Think about it and write PHP yourself. Can the WeChat red envelope random generation algorithm achieve similar functions (in fact, I dare not say it is an algorithm).
// $bonus_total Total amount of red envelopes
// $bonus_count Number of red envelopes
// $bonus_type Red envelope type 1=Spell Lucky red envelope 0 = ordinary red envelope
function randBonus($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;
}Summary: The above is the entire article Content, I hope it will be helpful to everyone's study.
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