Rechercher une fonction PHP

random_int

Contents

(PHP 7)

random_int — Generates cryptographically secure pseudo-random integers

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 used for this function are as follows:

  • On Windows, » CryptGenRandom() will always be used. As of PHP 7.2.0, the » CNG-API will always be used instead.
  • 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.

PHP: random_int - Manual Home of Manuel PHP  Contents Haut

Parameters

min

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

max

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

PHP: random_int - Manual Home of Manuel PHP  Contents Haut

Return Values

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

PHP: random_int - Manual Home of Manuel PHP  Contents Haut

Errors/Exceptions

  • 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.

PHP: random_int - Manual Home of Manuel PHP  Contents Haut

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)

PHP: random_int - Manual Home of Manuel PHP  Contents Haut

See Also

  • random_bytes() - Generates cryptographically secure pseudo-random bytes
Find a PHP function

English translation

You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.

If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.

Thank you in advance.

Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-random-int.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

  1. View the html document Language of the document:fr Manuel PHP : http://php.net

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut