基于@ Allain的

answer/

link，我在PHP中處理了這個快速函數。如果要使用非整數加權，則必須修改它。

/**

* getRandomWeightedElement()

* Utility function for getting random values with weighting.

* Pass in an associative array, such as array('A'=>5, 'B'=>45, 'C'=>50)

* An array like this means that "A" has a 5% chance of being selected, "B" 45%, and "C" 50%.

* The return value is the array key, A, B, or C in this case. Note that the values assigned

* do not have to be percentages. The values are simply relative to each other. If one value

* weight was 2, and the other weight of 1, the value with the weight of 2 has about a 66%

* chance of being selected. Also note that weights should be integers.

*

* @param array $weightedValues

*/

function getRandomWeightedElement(array $weightedValues) {

$rand = mt_rand(1, (int) array_sum($weightedValues));

foreach ($weightedValues as $key => $value) {

$rand -= $value;

if ($rand <= 0) {

return $key;

}

}

}

總結

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