php random x digit number

Question

I need to create a random number with x amount of digits.

So lets say x is 5, I need a number to be eg. 35562 If x is 3, then it would throw back something like; 463

Answer 1

rand(1000, 9999); works more faster than x4 times rand(0,9);

benchmark:

rand(1000, 9999)      : 0.147 sec.
rand(0,9)x4 times     : 0.547 sec.

both functions was running in 100000 iterations to make results more explicit

Answer 2

Treat your number as a list of digits and just append a random digit each time:

function n_digit_random($digits) {
  $temp = "";

  for ($i = 0; $i < $digits; $i++) {
    $temp .= rand(0, 9);
  }

  return (int)$temp;
}

---

Or a purely numerical solution:

function n_digit_random($digits)
  return rand(pow(10, $digits - 1) - 1, pow(10, $digits) - 1);
}

Answer 3

rand or mt_rand will do...

usage:

rand(min, max);

mt_rand(min, max);

Answer 4

Well you can use as simple php function mt_rand(2000,9000) which can generate a 4 digit random number

mt_rand(2000,9000) 

Answer 5

This is another simple solution to generate random number of N digits:

$number_of_digits = 10;
echo substr(number_format(time() * mt_rand(),0,'',''),0,$number_of_digits);

Check it here: http://codepad.org/pyVvNiof

Answer 6

The following code generates a 4 digits random number:

echo sprintf( "%04d", rand(0,9999));