random_int

(PHP 7, PHP 8)

random_intGet a cryptographically secure, uniformly selected integer

Description

random_int(int $min, int $max): int

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 in the order of priority are as follows:

  • Linux: » getrandom(), /dev/urandom

  • FreeBSD >= 12 (PHP >= 7.3): » getrandom(), /dev/urandom

  • Windows (PHP >= 7.2): » CNG-API

    Windows: » CryptGenRandom

  • macOS (PHP >= 8.2; >= 8.1.9; >= 8.0.22 if CCRandomGenerateBytes is available at compile time): CCRandomGenerateBytes()

    macOS (PHP >= 8.1; >= 8.0.2): arc4random_buf(), /dev/urandom

  • NetBSD >= 7 (PHP >= 7.1; >= 7.0.1): arc4random_buf(), /dev/urandom

  • OpenBSD >= 5.5 (PHP >= 7.1; >= 7.0.1): arc4random_buf(), /dev/urandom

  • DragonflyBSD (PHP >= 8.1): » getrandom(), /dev/urandom

  • Solaris (PHP >= 8.1): » getrandom(), /dev/urandom

  • Any combination of operating system and PHP version not previously mentioned: /dev/urandom
  • If none of the sources are available or they all fail to generate randomness, then a Random\RandomException 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.

Parameters

min

The lowest value to be returned.

max

The highest value to be returned.

Return Values

A cryptographically secure, uniformly selected integer from the closed interval [min, max]. Both min and max are possible return values.

Errors/Exceptions

Changelog

Version Description
8.2.0 In case of a CSPRNG failure, this function will now throw a Random\RandomException. Previously a plain Exception was thrown.

Examples

Example #1 random_int() example

<?php
var_dump
(random_int(100, 999));
var_dump(random_int(-1000, 0));
?>

The above example will output something similar to:

int(248)
int(-898)

See Also