Completely random numbers without repeating

Task

Today I faced the task of making 4 random numbers in a given range, without repeating, it would seem such a trivial task, but!

The usual rand ($ min, $ max) did not give the desired result, especially with a small number of $ max ~ 15;

I.e:



$number[0] = rand(1, $max);

$number[1] = rand(1, $max);

$number[2] = rand(1, $max);

$number[3] = rand(1, $max);





Could end up giving out 2, 2, 3, 9 - I didn’t need these repetitions, asking for advice on the habrakanal, freefd gave a link to the barley-style cookbook , but I didn’t like the implementation because of its loudness and non-singularity.

')

Decision

As a result, having shown ingenuity, this solution appeared:



function generateFourRandomNumber ($maxCount){

$numbers = range(1, $maxCount);

shuffle($numbers);

return array($numbers[0], $numbers[1], $numbers[2], $numbers[3]);

}



Total

Voila! Simply lapidary, and even strange :)

few BUT :

• the solution is suitable for small maximum values, otherwise the shuffle will then be too expensive
• the function is easy to remake by the form generateRandomNumber ($ maximum, $ count)

UPD

Thanks to duncanf1 for an even shorter version:

function generateRandomNumber ($maximum, $count){

return array_rand(range(0, $maximum), $count);

}