random_int()

版本：php7

(PHP 7)

Generates cryptographically secure pseudo-random integers

说明

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-APIwill always be used instead.
• On Linux,the» getrandom(2)syscall will be used if available.
• On other platforms,/dev/urandomwill be used.
• If none of the aforementioned sources are available, then anExceptionwill be thrown.

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

参数

The lowest value to be returned, which must bePHP_INT_MINor higher.

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

返回值

Returns a cryptographically secure random integer in the range$minto$max, inclusive.

错误／异常

• If an appropriate source of randomness cannot be found,anExceptionwill be thrown.
• If invalid parameters are given,aTypeErrorwill be thrown.
• If$maxis less than$min,anErrorwill be thrown.

范例

Example #1random_int()example

以上例程的输出类似于：

int(248)
int(-898)

参见

• random_bytes()Generates cryptographically secure pseudo-random bytes

Here is a simple backporting function, it works for PHP >= 5.1

Randomness test

鹏仔微信 15129739599 鹏仔QQ344225443 鹏仔前端 pjxi.com 共享博客 sharedbk.com