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PHP Quiz PHP CertificatePHP rand() Function
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))
?>
echo(rand() . "<br />");
echo(rand() . "<br />");
echo(rand(10,100))
?>
The output of the code above could be:
17757
3794
97
3794
97
Complete PHP Math Reference
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