Backend DevelopmentPHP TutorialUse PHP to write a red envelope program, PHP to write a red envelope program_PHP tutorialUse PHP to write a red envelope program, PHP to write a red envelope program_PHP tutorial
Use PHP to write a red envelope program, PHP to write a red envelope program
Use PHP to send red envelopes. When we enter the number and total amount of red envelopes, PHP will perform randomization based on these two values. Distribute each amount to ensure 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.
Let’s analyze the rules first.
Set the total amount to 10 yuan, and N people will receive it randomly:
N=1 first
Then the amount of the red envelope = 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';
Run the above code and the following results will be output:
The first red envelope, the amount is 2.08 yuan, and the balance is 17.92 yuan
The second red envelope, the amount is 1.81 yuan, and the balance is 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 7th red envelope, the amount is 1.21 yuan, and the balance is 10.52 yuan
The 8th red envelope, the amount is 2.58 yuan, and the balance is 7.94 yuan
The 9th red envelope, the amount is 5.4 yuan, and the balance is 2.54 yuan
The 10th red envelope, amount 2.54 yuan, balance 0 yuan
Attached is the complete code:
html code
<script type="text/javascript" src="http://libs.useso.com/js/jquery/1.7.2/jquery.min.js"></script>
<style>
.demo{width:300px; margin:60px auto 10px auto}
@media only screen and (min-width: 420px) {
.demo{width:500px; margin:60px auto 10px auto}
}
.demo p{height:62px; line-height:30px}
.demo p label{width:100px; text-align:right}
.input{width:140px; height:24px; line-height:14px; border:1px solid #d3d3d3}
button, .button {
background-color: #f30;color: white;border: none;box-shadow: none;
font-size: 17px;font-weight: 500;font-weight: 600;
border-radius: 3px;padding: 15px 35px;margin: 26px 5px 0 0px;cursor: pointer; }
button:hover, .button:hover {background-color: #f00; }
#result{width:360px; margin:10px auto}
#result p{line-height:30px}
#result p span{margin:4px; color:#f30}
</style>
</head>
<body>
<div id="main">
<div class="demo">
<button>生成10个红包，总金额20元</button>
</div>
<div id="result"></div>
<div class="ad_76090"><script src="/js/ad_js/bd_76090.js" type="text/javascript"></script></div><br/>
</div>
<script>
$(function(){
$("button").click(function(){
$.ajax({
type: 'POST',
url: 'bao.php',
dataType: 'json',
beforeSend: function(){
$("#result").html('正在分配红包');
},
success: function(json){
if(json.msg==1){
var str = '';
var res = json.res;
$.each(res,function(index,array){
str += '<p>第<span>'+array['i']+'</span>个红包，金额<span>'+array['money']+'</span>元，余额<span>'+array['total']+'元</span></p>';
});
$("#result").html(str);
}else{
$("#result").html('数据出错！');
}
}
});
});
});
</script>
php code
<?php
header("Content-Type: text/html;charset=utf-8");
$total=20;//红包总额
$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;
$arr['res'][$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 entire content of this article. I hope it will be helpful for everyone to use PHP proficiently to complete the red envelope distribution program.
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