Using PHP to write red envelopes program, PHP writing Red envelope program _php Tutorial

Use PHP to write red envelopes program, PHP write red envelopes Program

Using PHP to send red envelopes, when we enter the number of red envelopes and the total amount, PHP will be based on these two values randomly allocated each amount, to ensure that everyone can receive a red envelope, each red envelope amount is different, is to request the amount of red envelopes, all the total amount should be equal to the total amount.

Let's start by analyzing the rules.

Set the total amount is 10 yuan, there are n people randomly pick:
N=1 the first one
The red envelope amount =x yuan;
N=2 a second
To ensure that the second red envelope can be issued normally, the first red envelope amount = 0.01 to 9.99 a random number.
The second red envelope =10-the first red envelope amount;
N=3 a third
A random number between red envelopes 1=0.01 to 9.99
A random number of red envelopes 2=0.01 to (10-red envelope 1-0.01)
Red Envelopes 3=10-Red Envelopes 1-Red Envelopes 2
......

So we get a rule, in allocating the current red envelope amount, the minimum amount required to reserve the remaining red and white, and then in 0.01 to the total amount-reserve amount of random number, the resulting random number is the current red envelope allocation amount.

In practice, the program will first assign a good amount of red envelopes, that is, when the red envelopes, the number of red envelopes and the amount of each red envelope is allocated well, then users to rob red envelopes, we randomly give users back a red envelope can.

Red Envelope Distribution Code:

$total =20;//Red Envelope Total amount  $num =10;//divided into 10 red envelopes, support 10 people randomly receive  $min =0.01;//Everyone can receive at least 0.01 yuan for   ($i =1; $i < $num; $i + +)  {    $safe _total= ($total-($num-$i) * $min)/($num-$i);//random Security cap    $money =mt_rand ($min *100, $safe _total*100) /100;    $total = $total-$money;      Echo ' $i. ' A red envelope: ' $money. ' Yuan, balance: '. $total. ';  }  Echo ' $num. ' A red envelope: ' $total. ' Yuan, balance: 0 Yuan ';  

Running the above code will output the following results:

The 1th red envelope, the amount of 2.08 yuan, the balance of 17.92 yuan
The 2nd red envelope, the amount of 1.81 yuan, the balance of 16.11 yuan
The 3rd red envelope, the amount of 0.15 yuan, the balance of 15.96 yuan
The 4th red envelope, the amount of 1.61 yuan, the balance of 14.35 yuan
The 5th Red envelope, the amount of 1.11 yuan, the balance of 13.24 yuan
The 6th red envelope, the amount of 1.51 yuan, the balance of 11.73 yuan
The 7th Red envelope, the amount of 1.21 yuan, the balance of 10.52 yuan
The 8th red envelope, the amount of 2.58 yuan, the balance of 7.94 yuan
The 9th red envelope, the amount of 5.4 yuan, the balance of 2.54 yuan
The 10th red envelope, the amount of 2.54 yuan, the balance of 0 yuan

Enclose the complete code:

HTML code

  Generate 10 Red envelopes with a total amount of $20   

PHP code

<?phpheader ("Content-type:text/html;charset=utf-8"), $total =20;//red envelope total $num =10;//divided into 10 red envelopes, support 10 people randomly pick $min =0.01;// Each person will receive at least $0.01 for ($i =1; $i < $num; $i + +) {   $safe _total= ($total-($num-$i) * $min)/($num-$i);//random security cap   $money = Mt_rand ($min *100, $safe _total*100)/100;   $total = $total-$money;  $arr [' Res '] [$i] = array (' i ' + = $i, ' money ' = ' $money, ' total ' = $total);} $arr [' Res '] [$num] = array (' i ' + = $num, ' money ' = = $total, ' total ' =>0); $arr [' msg '] = 1;echo json_encode ($arr);? >

The above is the whole content of this article, I hope that we are proficient in the application of PHP to complete the red envelope program to help.

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