(PHP 4, PHP 5, PHP 7)
mt_rand — Generate a better random value
$min
, int $max
)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).
Această funcție nu generează valori securizate din punct de vedere criptografic și deci nu trebuie utilizată pentru scopuri criptografice. Dacă aveți nevoie de o valoare securizată din punct de vedere criptografic considerați utilizarea random_int(), random_bytes() sau openssl_random_pseudo_bytes() în schimb.
minOptional lowest value to be returned (default: 0)
maxOptional highest value to be returned (default: mt_getrandmax())
A random integer value between min (or 0)
and max (or mt_getrandmax(), inclusive),
or FALSE if max is less than min.
| Versiune | Descriere |
|---|---|
| 5.3.4 |
Issues an E_WARNING and returns FALSE if
max < min.
|
Example #1 mt_rand() example
<?php
echo mt_rand() . "\n";
echo mt_rand() . "\n";
echo mt_rand(5, 15);
?>
Exemplul de mai sus va afișa ceva similar cu:
1604716014 1478613278 6
min max range must
be within the range mt_getrandmax(). i.e. (max -
min) <= mt_getrandmax()
Otherwise, mt_rand() may return poor random numbers
than it should be.