php 한글 메뉴얼 도움말 검색 사이트 Generates cryptographically secure pseudo-random integers [function.random-int]

설명

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.

인수

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.

반환값

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

오류/예외

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.

예제

Example #1 random_int() example


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

위 예제의 출력 예시:

int(248)
int(-898)

참고

random_bytes() - Generates cryptographically secure pseudo-random bytes