php man page for rand

RAND(3) 								 1								   RAND(3)

rand - Generate a random integer

SYNOPSIS
       int rand (void  )

DESCRIPTION
       int rand (int  $min, int  $max)

	If  called  without  the  optional $min, $max arguments rand(3) returns a pseudo-random integer between 0 and getrandmax(3). If you want a
       random number between 5 and 15 (inclusive), for example, use rand(5, 15).

       Caution

	      This function does not generate cryptographically secure values, and should not be used for cryptographic purposes. If  you  need  a
	      cryptographically secure value, consider using random_int(3), random_bytes(3), or openssl_random_pseudo_bytes(3) instead.

       Note

	       On  some  platforms  (such  as Windows), getrandmax(3) is only 32767. If you require a range larger than 32767, specifying $min and
	      $max will allow you to create a range larger than this, or consider using mt_rand(3) instead.

PARAMETERS
	      o $min
		- The lowest value to return (default: 0)

	      o $max
		- The highest value to return (default: getrandmax(3))

RETURN VALUES
	A pseudo random value between $min (or 0) and $max (or getrandmax(3), inclusive).

EXAMPLES
       Example #1

	      rand(3) example

	      <?php
	      echo rand() . "
";
	      echo rand() . "
";

	      echo rand(5, 15);
	      ?>

	      The above example will output something similar to:

	      7771
	      22264
	      11

SEE ALSO
       srand(3), getrandmax(3), mt_rand(3), random_int(3), random_bytes(3), openssl_random_pseudo_bytes(3).

PHP Documentation Group 														   RAND(3)