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PHP rand() Function

PHP Math Reference Complete PHP Math Reference

Definition and Usage

The rand() function generates a random integer.

If this function is called without parameters, it returns a random integer between 0 and RAND_MAX.

If you want a random number between 10 and 100 (inclusive), use rand (10,100).

Syntax

rand(min,max)

Parameter Description
min,max Optional. Specifies the range the random number should lie within

Tips and Notes

Note: On some platforms (such as Windows) RAND_MAX is only 32768. So, if you require a range larger than 32768, you can specify min and max, or use the mt_rand() function instead.

Note: In PHP 4.2.0 and later, there is no need to seed the random generator with srand(). This is done automatically.

Tip: The mt_rand() function generates a better random value than this function!

Example

In this example we will return some random numbers:

<?php
echo(rand() . "<br />");
echo(rand() . "<br />");
echo(rand(10,100))
?>

The output of the code above could be:

17757
3794
97

PHP Math Reference Complete PHP Math Reference
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