random_int - Generates cryptographically secure pseudo-random integers
Вернуться к: CSPRNG Функции
random_int
(PHP 7)
random_int — Generates cryptographically secure pseudo-random integers
Описание
$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.
Замечание: Although this function was added to PHP in PHP 7.0, a » userland implementation is available for PHP 5.2 to 5.6, inclusive.
Список параметров
-
min -
The lowest value to be returned, which must be
PHP_INT_MINor higher. -
max -
The highest value to be returned, which must be less than or equal to
PHP_INT_MAX.
Возвращаемые значения
Returns a cryptographically secure random integer in the range
min to max, inclusive.
Ошибки
- 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
maxis less thanmin, an Error will be thrown.
Примеры
Пример #1 random_int() example
<?php
var_dump(random_int(100, 999));
var_dump(random_int(-1000, 0));
?>
Результатом выполнения данного примера будет что-то подобное:
int(248) int(-898)
Смотрите также
- random_bytes() - Generates cryptographically secure pseudo-random bytes
Вернуться к: CSPRNG Функции