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PHP实现微信发红包程序_php实例

Jun 07, 2016 pm 05:11 PM

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。

查看演示                        下载源码

首先给大家分析下规律。

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'; 
Copy after login

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

以上就是使用php实现微信发红包程序,希望对大家有所帮助,有需要源码的朋友,可以直接下载。

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