php-biased-random

Get random elements based on probabilty

How to Use

$randomizer = new Randomizer();
$randomizer->add( new Element('Banana', 70))
           ->add( new Element('Apple',  30));

$randomFruit = $randomizer->get(); // Chance of Banana is 70%

Calculate Probability

In some cases, you want to add multiple items and retrieve the probabilty of an item.

$randomizer = new Randomizer();
$randomizer->add( new Element('Banana', 2))
           ->add( new Element('Apple',  1))
           ->add( new Element('Banana', 2));

$probability = $randomizer->getProbabilityFor('Banana');
echo $probability; // outputs 0.8

Shorthand methods

You don't need to create Element wrapper objects. You can just add your elements to the Randomizer:

$randomizer = new Randomizer();
$randomizer->add('banana')->add('apple');

// with weight
$randomizer->add('banana', 10)->add('apple', 5);

Note: If you add multiple identical items, they will be combined into a single element with adjusted weight.