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rand
Generate a random integer
(PHP 4, PHP 5)
int rand ( [int min, int max] )
If called without the optional min,
max arguments rand()
returns a pseudo-random integer between 0 and
RAND_MAX. If you want a random number
between 5 and 15 (inclusive), for example, use rand (5,
15).
On some platforms (such as Windows) RAND_MAX
is only 32768. If you require a range larger than 32768, specifying
min and max will allow
you to create a range larger than RAND_MAX, or consider using
mt_rand() instead.
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
The lowest value to return (default: 0)
- max
The highest value to return (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 1158. rand() example
<?php
echo rand() . "\n";
echo rand() . "\n";
echo rand(5, 15);
?>The above example will output something similar to:
7771
22264
11
| srand() |
| getrandmax() |
| mt_rand() |