PHP implements WeChat red envelope program, php implements red envelope_PHP tutorial

PHP implements WeChat red envelope sending program, php implements red envelopes

Use PHP to send red envelopes. When we enter the number and total amount of red envelopes, PHP will randomly distribute them based on these two values. For each amount, it is guaranteed that everyone can receive a red envelope. The amount of each red envelope is different, which means that the amount of the red envelope must be different, and the total amount of all red envelopes should be equal to the total amount.

View Demo Download Source Code

First of all, let me analyze the rules for you.

Set the total amount to 10 yuan, and N people will receive it randomly:

N=1 first

Then the red envelope amount=X yuan;

N=2 second

To ensure that the second red envelope can be issued normally, the amount of the first red envelope = a random number between 0.01 and 9.99.

The second red envelope = 10-the amount of the first red envelope;

N=3 third

Red envelope 1=a random number between 0.01 and 9.99

Red envelope 2=a random number from 0.01 to (10-red envelope 1-0.01)

Red envelope 3=10-Red envelope 1-Red envelope 2

……

So we get a rule. When allocating the current red envelope amount, first reserve the minimum amount required for the remaining red and white, and then take a random number between 0.01 and the total amount - the reserved amount. The random number obtained is the current red envelope allocation. amount.

In actual application, the program first allocates the amount of red envelopes. That is, when sending red envelopes, the number of red envelopes and the amount of each red envelope are allocated. Then when the user comes to grab the red envelope, we can randomly return a red envelope to the user. .

Red envelope distribution code:

$total=20;//红包总金额 
$num=10;// 分成10个红包，支持10人随机领取 
$min=0.01;//每个人最少能收到0.01元 
for ($i=1;$i<$num;$i++) 
{ 
 $safe_total=($total-($num-$i)*$min)/($num-$i);//随机安全上限 
 $money=mt_rand($min*100,$safe_total*100)/100; 
 $total=$total-$money; 
 echo '第'.$i.'个红包：'.$money.' 元，余额：'.$total.' 元 '; 
}
echo '第'.$num.'个红包：'.$total.' 元，余额：0 元'; 

Running the above code will output the following results:

The first red envelope, the amount is 2.08 yuan, and the balance is 17.92 yuan

The second red envelope has an amount of 1.81 yuan and a balance of 16.11 yuan

The third red envelope, amount 0.15 yuan, balance 15.96 yuan

The fourth red envelope, the amount is 1.61 yuan, and the balance is 14.35 yuan

The fifth red envelope, the amount is 1.11 yuan, and the balance is 13.24 yuan

The 6th red envelope, the amount is 1.51 yuan, and the balance is 11.73 yuan

The seventh red envelope, the amount is 1.21 yuan, and the balance is 10.52 yuan

The 8th red envelope, amount 2.58 yuan, balance 7.94 yuan

The 9th red envelope, the amount is 5.4 yuan, the balance is 2.54 yuan

The 10th red envelope, amount 2.54 yuan, balance 0 yuan

The above is the program for sending red envelopes on WeChat using PHP. I hope it will be helpful to everyone. Friends who need the source code can download it directly.

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