PHP rand() Function
Definition and Usage
The rand() function returns a random integer.
Syntax
rand(min,max)
| Parameter | Description |
|---|---|
| min,max | Optional. Specifies the range of random numbers generated. |
Description
If no optional parameters are provided min and max, rand() returns a pseudo-random integer between 0 and RAND_MAX. For example, to get a random number between 5 and 15 (including 5 and 15), use rand(5, 15).
Tips and Notes
Note:Under some platforms (such as Windows), RAND_MAX is only 32768. If the required range is greater than 32768, then specifying the min and max parameters can generate numbers greater than RAND_MAX, or consider using mt_rand() instead.
Note:Since PHP 4.2.0, it is no longer necessary to use srand() or mt_srand() The function seeds the random number generator, which is now automatically completed.
Note:In versions before 3.0.7, the meaning of max was range. To get the same random numbers from 5 to 15 as in the previous example, a brief example is rand(5, 11).
Example
This example will return some random numbers:
<?php echo(rand(); echo(rand(); echo(rand(10,100)) ?>
Output:
17757 3794 97
