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mt_rand() - math

Many random number generators of older libcs have dubious or unknown characteristics and are slow. By default, PHP uses the libc random number generator with the rand() function. The mt_rand() function is a drop-in replacement for this. 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())

  • Syntax

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


    <?phpecho mt_rand() . "\n";echo mt_rand() . "\n";echo mt_rand(5, 15);?>

    Output / Return Value


    Alternatives / See Also