Generate array of random unique numbers in PHP

Question

I\'m trying to generate an array of random numbers from 0-n then shuffle (but ensure that the keys and values DO NOT match).

For example:

0 => 3
1         


        

Answer 1

This will generate an array with 10 random numbers from 0 to 100:

array_map(function () {
       return rand(0, 100);
   }, array_fill(0, 10, null)
);

Result:

array(10) {
  [0]=>
  int(15)
  [1]=>
  int(97)
  [2]=>
  int(20)
  [3]=>
  int(64)
  [4]=>
  int(57)
  [5]=>
  int(38)
  [6]=>
  int(16)
  [7]=>
  int(53)
  [8]=>
  int(56)
  [9]=>
  int(22)
}

Explanation:

• array_fill(0, 10, null) will generate an array with 10 empty items
• array_map Applies the callback (first argument) to each item of the array it receives (second argument). In this example, we just return a random number for each array item.

Playground: https://3v4l.org/FffN6