Question

What is the most effective way to create a PHP function that will pick a given amount of random number, but evenly spaced out and contain no duplicates?

For example say you wanted 3 random number between 0-6 the result could be [0, 2, 5] or [1, 3, 6].

Any ideas on how to get started?

Answer 1

Note that none of codes below will work directly as a copy paste.

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If you want to select a random number, use mt_rand(min, max).

If you want to select a random number which is divisible by N, use mt_rand(min, max)*N.

If you want to select M random numbers which are all divisible by N, use a loop:

for($i = 0; $i <= M-1; $i++) {
    $result[$i] = mt_rand(min, max)*N;
}
print_r($result);

That is what I understand from your question.