mt_rand
(PHP 4, PHP 5)
mt_rand — Generate a better random value
Descrierea
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 RAND_MAX. If you want a random number between 5 and 15 (inclusive), for example, use mt_rand (5, 15).
Notă: Începând cu PHP 4.2.0 nu este nevoie de a însămânţa generatorul de numere aleatoare prin intermediul srand() sau mt_srand(), deoarece aceasta se efectuează în mod automat.
Parametri
- min
-
Optional lowest value to be returned (default: 0)
- max
-
Optional highest value to be returned (default: RAND_MAX)
Valorile întroarse
A random integer value between min (or 0) and max (or RAND_MAX, inclusive)
Istoria schimbărilor
| Versiunea | Descriere |
|---|---|
| Since 3.0.7 | In versions before 3.0.7 the meaning of max was range . To get the same results in these versions the short example should be rand (5, 11) to get a random number between 5 and 15. |
Exemple
Example#1 mt_rand() example
<?php
echo mt_rand() . "\n";
echo mt_rand() . "\n";
echo mt_rand(5, 15);
?>
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