Generates cryptographically secure pseudo-random integers

Description

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.

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.

Return Values

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

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.

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)

random_int

Description

Parameters

Return Values

Errors/Exceptions

Examples

See Also