How to use the random function correctly in php?

Question

How to use the random function correctly in php?

Good afternoon. I'm teaching pcp, I ran into this problem: there is a script that generates 1 random number. But on the server, the time is updated every few seconds, so if you quickly over-execute the script several times, the generator generates the same number. How do I get around this problem?

1

php случайные-числа

Author: Эникейщик, 2018-04-23

Source

2 answers

score 1 · Answer 1

mt_rand() the most proven and reliable function that returns a pseudo-random number does not depend on the server in any way and can not generate the same numbers because of the server, use this function and you will almost a real random number. You can also use the more modern function random_int, but it has its own nuances that the first function does not have.

score 0 · Answer 2

$array = [];
function getRandom($min = 0, $max = 9999, $try = 0) use ($array)
{
   $int = mt_rand($min, $max);

   if (in_array($int, $array) || $try > 5) {
       return getRandom($min, $max, ++$try);
   }

   return $int;
}

Instead of $array, you can take/store numbers in the base