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Last updated: Tue, 19 Sep 2006


(PHP 3, PHP 4, PHP 5)

rand -- Generate a random integer


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).

Example 1. rand() example

echo rand() . "\n";
echo rand() . "\n";

echo rand(5, 15);

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().

Last updated: Tue, 19 Sep 2006