php - Controlling likelyhood of randomly generated numbers -

php - Controlling likelyhood of randomly generated numbers -

if wanted random number between 1 , 3 $n = mt_rand(1,3).

there 33% chance $n = 1, 33% chance it's 2, , 33% chance it's 3.

what if want create more hard 3 1?

say want 50% chance 1 drawn, 30% chance 2 drawn , 20% chance 3 drawn?

i need scalable solution possible range vary between 1-3 , 1-100, in general i'd lower numbers drawn more higher ones.

how can accomplish this?

this maths.

in illustration chose random number between 0 , 99.

values returned between 0 49 - phone call 1 values returned between 50 - 69 - phone call 2 values returned between 70 - 99 - phone call 3

simple if statement or populate array distribution required

php random dice