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mt_rand
Generate a better random value
(PHP 4, PHP 5)
int mt_rand ( [int 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
RAND_MAX. If you want a random number
between 5 and 15 (inclusive), for example, use mt_rand
(5, 15).
As of PHP 4.2.0, there is no need to seed the random number generator with srand() or mt_srand() as this is now done automatically.
Parameters
- min
Optional lowest value to be returned (default: 0)
- max
Optional highest value to be returned (default: RAND_MAX)
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.
|
Examples
Example 1152. 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
| mt_srand() |
| mt_getrandmax() |
| rand() |