使用PHP编写发红包程序_php实例
使用PHP发红包，当我们输入红包数量和总金额后，PHP会根据这两个值进行随机分配每个金额，保证每个人都能领取到一个红包，每个红包金额不等，就是要求红包金额要有差异，所有红包金额总额应该等于总金额。
我们先来分析下规律。
设定总金额为10元，有N个人随机领取：
N=1 第一个
则红包金额=X元；
N=2 第二个
为保证第二个红包可以正常发出，第一个红包金额=0.01至9.99之间的某个随机数。
第二个红包=10-第一个红包金额；
N=3 第三个
红包1=0.01至9.99之间的某个随机数
红包2=0.01至(10-红包1-0.01)的某个随机数
红包3=10-红包1-红包2
……
于是我们得到一个规律，在分配当前红包金额时，先预留剩余红白所需最少金额，然后在0.01至总金额-预留金额间取随机数，得到的随机数就是当前红包分配的金额。
实际应用中，程序先将红包金额分配好，即发红包时，红包个数以及每个红包的金额都分配好了，那么用户来抢红包时，我们随机给用户返回一个红包即可。
红包分配代码：
$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';
运行以上代码，会输出以下结果：
第1个红包，金额2.08元，余额17.92元
第2个红包，金额1.81元，余额16.11元
第3个红包，金额0.15元，余额15.96元
第4个红包，金额1.61元，余额14.35元
第5个红包，金额1.11元，余额13.24元
第6个红包，金额1.51元，余额11.73元
第7个红包，金额1.21元，余额10.52元
第8个红包，金额2.58元，余额7.94元
第9个红包，金额5.4元，余额2.54元
第10个红包，金额2.54元，余额0元
附上完整代码：
html代码
<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代码
<?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);
?>
以上所述就是本文的全部内容了，希望对大家熟练应用php完成派红包程序有所帮助。
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