mt_rand
(PHP 4, PHP 5)
mt_rand — Generate a better random value
Beskrivelse
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).
Note: Fra PHP 4.2.0, er det ikke nødvendigt at salte generatoren til tilfældige numre med srand() eller mt_srand(), da det nu gøres automatisk.
Parameterliste
- min
-
Optional lowest value to be returned (default: 0)
- max
-
Optional highest value to be returned (default: RAND_MAX)
Returneringsværdier
A random integer value between min (or 0) and max (or RAND_MAX, inclusive)
ChangeLog
Version | Beskrivelse |
---|---|
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. |
Eksempler
Example#1 mt_rand() example
<?php
echo mt_rand() . "\n";
echo mt_rand() . "\n";
echo mt_rand(5, 15);
?>
Ovenstående eksempel vil udskrive noget der ligner:
1604716014 1478613278 6