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PHP Manual :: random_int

random_bytes || Hash || CSPRNG Functions || PHP Manual

(PHP 7)

random_intGenerates cryptographically secure pseudo-random integers


int random_int ( int $min , int $max )

Generates cryptographic random integers that are suitable for use where unbiased results are critical, such as when shuffling a deck of cards for a poker game.

The sources of randomness used for this function are as follows:

  • On Windows, » CryptGenRandom() will always be used.
  • On Linux, the » getrandom(2) syscall will be used if available.
  • On other platforms, /dev/urandom will be used.
  • If none of the aforementioned sources are available, then an Exception will be thrown.

Note: Although this function was added to PHP in PHP 7.0, a » userland implementation is available for PHP 5.2 to 5.6, inclusive.



The lowest value to be returned, which must be PHP_INT_MIN or higher.


The highest value to be returned, which must be less than or equal to PHP_INT_MAX.

Return Values

Returns a cryptographically secure random integer in the range min to max, inclusive.


  • If an appropriate source of randomness cannot be found, an Exception will be thrown.
  • If invalid parameters are given, a TypeError will be thrown.
  • If max is less than min, an Error will be thrown.


Example #1 random_int() example


The above example will output something similar to:


See Also

  • random_bytes() - Generates cryptographically secure pseudo-random bytes

random_bytes || Hash || CSPRNG Functions || PHP Manual
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