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PHP Functions

Function: rand

(PHP 3, PHP 4, PHP 5)

rand -- Generate a random integer

Description

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

<?php
echo rand() . "\n";
echo rand() . "\n";

echo rand(5, 15);
?>

The above example will output something similar to:

7771
22264
11

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.

Related Function(s)

  • mt_rand()
  • srand()
  • mt_srand()
  • getrandmax()
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