How to generate 3 non repeated random numbers from a range?

Question

Using PHP, how can I select 3 numbers from a numbers range, that don't repeat theirselves?

For example from a range 1 - 100, an answer may be 5, 32, 12, but not 5, 5, 93

Thank you

google is you're friend. Just look up how to it once then do it x times until you get 3 numbers. — SaggingRufus, Mar 16 '17 at 14:43
Easiest way is to use a loop to check last generated number and ignore new one if match the last one :) — , Mar 16 '17 at 14:44
@Pashiamas it does seem homeworky, but you have 10 gold badges, so I assume you know not to do that. Then again, I would have also assumed someone with as many famous question as yourself would have provided us with some code that you have tried. — SaggingRufus, Mar 16 '17 at 15:00

score 3 · Accepted Answer · edited Mar 16 '17 at 14:53

3

Create array of numbers from 1 to 100:

$numbers = range(1, 100);

Shuffle all numbers:

shuffle($numbers);

Retrieve only 3 of them:

$randomNumbers = array_slice($numbers, 0, 3);

edited Mar 16 '17 at 14:53

AbraCadaver

78,200
7
66
87

answered Mar 16 '17 at 14:50

Chuck Norris

1,125
1
12
28

score 0 · Answer 2 · answered Mar 16 '17 at 14:47

Try this:

$numbers = [];
$min = 1;
$max = 3;

for($i=0; $i<3; $i++){
    $rnd = rand($min, $max);
    while(in_array($rnd, $numbers)){ // while generated random number is already in the numbers array
        $rnd = rand($min, $max); // generate a new random number
    } // loop ends when newly generated random number is not in the array already
    array_push($numbers, $rnd); // push the new random number into the array
}

It will generate 3 different numbers between 1 and 3, and save them into the $numbers array.

How to generate 3 non repeated random numbers from a range?

2 Answers2