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mt_rand

Tags: PHP 5.x PHP 7.x PHP 8.x

mt_rand — Generate a random value via the Mersenne Twister Random Number Generator.

Description

mt_rand(
    
): int

Description

mt_rand(
    int $min,
int $max
): int

Caution: This function does not generate cryptographically secure values, and should not be used for cryptographic purposes. If you need a cryptographically secure value, consider using random_int(), random_bytes(), or openssl_random_pseudo_bytes() instead.

Many random number generators of older libcs have dubious or unknown characteristics and are slow. The mt_rand() function is a drop-in replacement for the older rand(). It uses a random number generator with known characteristics using the » Mersenne Twister, which will produce random numbers four times faster than what the average libc rand() provides.
If called without the optional min, max arguments mt_rand() returns a pseudo-random value between 0 and mt_getrandmax(). If you want a random number between 5 and 15 (inclusive), for example, use mt_rand(5, 15).

Parameters

min
Optional lowest value to be returned (default: 0).
max
Optional highest value to be returned (default: mt_getrandmax()).

Return Values

A random integer value between min (or 0) and max (or mt_getrandmax(), inclusive), or false if max is less than min.

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