mt_rand
(PHP 4, PHP 5)
mt_rand — Generate a better random value
Description
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: 由PHP 4.2.0 始,您不需要再使用 srand() 或 mt_srand() 為亂數產生器提供種子,因為這已自動的提供了。
Parameters
- min
-
Optional lowest value to be returned (default: 0)
- max
-
Optional highest value to be returned (default: RAND_MAX)
Return Values
A random integer value between min (or 0) and max (or RAND_MAX, inclusive)
ChangeLog
Version | Description |
---|---|
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. |
範例
Example#1 mt_rand() example
<?php
echo mt_rand() . "\n";
echo mt_rand() . "\n";
echo mt_rand(5, 15);
?>
The above example will output something similar to:
1604716014 1478613278 6