How to get a random number with 'weight'?

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Indiepath

Well there are many ways to do this.

1) Use a wieghted SQL query (that don't help here)
2) Fill an array with the possibilities and choose at random from the array, for example.

Lets assume:

Red ball = 1 (weight 15)
Black ball = 2 (weight 3)
Blue Ball = 3 (Wieght 2)

So our array of numbers is :
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,3,3]

Choose a random position from the array and select the correct ball :)

This method is used widely.