具有分数的概率PHP数组(PHP array of probability with fractions)

具有分数的概率PHP数组(PHP array of probability with fractions)

我有以下数组：

public $percentage = array( 0 => 20.30, 1=> 19.96, 2=> 14.15, 3=> 45.59 );

//它总和为100％

我需要一个随机函数来返回键值的百分比，

例如：得到0的可能性是20.30％，得到2的可能性是14.15％，第一个用户得到0，第二个得到2。

请让我知道你建议我使用的功能是什么。

i have the following array:

public $percentage = array( 0 => 20.30, 1=> 19.96, 2=> 14.15, 3=> 45.59 );

// it sums in 100%

I need a random function to return the key by the percentage of the value,

for example: the possibility to get 0 is 20.30% and the possibility to get 2 is 14.15%, the first user got 0, the second one got 2.

Please let me know what is the function you suggest me to use.

最满意答案

将百分比转换为累计概率，然后将其与随机数进行比较。

如果随机数属于某个类别，则输出结果。 如果没有，移动到下一个，直到找到一个。 这使您可以根据数组中陈述的概率百分比输出一个数字。

$percentage = array( 0 => 20.30, 1=> 19.96, 2=> 14.15, 3=> 45.59 ); $random = mt_rand(0,10000)/100; foreach ($percentage as $key => $value) { $accumulate += $value; if ($random <= $accumulate) { echo $key; break; } }

Convert the percentages to an accumulated probability, then compare it with a random number.

If the random number falls into a category, outputs the result. If not, move onto the next one until one is found. This allows you to output a number based on the percentage probability stated in the array.

$percentage = array( 0 => 20.30, 1=> 19.96, 2=> 14.15, 3=> 45.59 ); $random = mt_rand(0,10000)/100; foreach ($percentage as $key => $value) { $accumulate += $value; if ($random <= $accumulate) { echo $key; break; } }