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rand (PHP 3, PHP 4, PHP 5) rand -- Generate a random integer Descriptionint 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).
Example 1. rand() example
<?php
echo rand() . "\n";
echo rand() . "\n";
echo rand(5, 15);
?>
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The above example will output
something similar to: |
Note:
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.
Note: 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.
Note:
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.
See also:
srand(),
getrandmax(), and
mt_rand().
Copyright © 1997 - 2007 by the PHP Documentation Group. This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later. A copy of the Open Publication License is distributed with this manual, the latest version is presently available at http://www.opencontent.org/openpub/.
Please see full copyright text at http://www.php.net/manual/en/copyright.php
Original version of the above documentation is available at http://www.php.net/manual/en/
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