使随机数在php中减少随机性

时间：2019-03-22 18:42:40

标签： php

我正在尝试在php中回显随机数。我在下面使用这种方法

event bus

它有效，但是我的问题是：例如，有人刷新页面时，我希望使数字的随机性降低，例如：

event bus

我使用的代码给出了随机数，但是我希望随机数以小数字跳跃，但不希望从20跳到100！

有没有简单的方法可以做到这一点？

4 个答案:

答案 0 :(得分：1)

您始终可以将随机数生成器上的范围更改为较小的范围。如果希望它具有更大的灵活性，您甚至可以在下面的示例中将30和35替换为变量，并根据需要计算时间来计算随机数的最大值和最小值。 

<?php
echo mt_rand(30, 35)." Users Online";
?>

答案 1 :(得分：1)

使用会话变量来跟踪数字。
如果设置了数字，则使随机数为先前值的+ -5。

<?php
session_start();
if(isset($_SESSION['num'])){
    $num = mt_rand($_SESSION['num']-5, $_SESSION['num']+5);
}else{
    $num = mt_rand(10, 100);
}
echo $num . " Users Online"; 
$_SESSION['num'] = $num;

答案 2 :(得分：1)

我有个建议……也许您真正想要的是一系列随机数。解释...您可以使用Switch语句根据您的第一个随机数实际传递结果。像这样：

SerializerMethodField

该例程的最终结果是首先随机选择一个数字，然后从最终范围中随机选择一个数字。

您可以对其进行调整以获得所需的任何结果。但这是基本思想。

答案 3 :(得分：1)

此示例消除了您在问题中描述的内容，它希望从20跳到100，但是可能会发生。 

$limit = mt_rand(10,20);
$diff = mt_rand(20,80);
echo mt_rand(mt_rand($limit-$diff>0?$limit-$diff:0, $limit), mt_rand($limit, 
$limit+$diff))." Users Online";

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在PHP Sandbox中自己进行测试

编辑 您可以通过更改$limit和$diff来获得适当的结果。

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