rand
(PHP 4, PHP 5)
rand — Generate a random integer
Popis
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).
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: Počínajúc PHP 4.2.0 nie je potrebné štartovať generátor náhodných čísel s srand() alebo mt_srand(), nakoľko sa tak učiní automaticky.
Parametre
- min
-
The lowest value to return (default: 0)
- max
-
The highest value to return (default: RAND_MAX)
Vrátené hodnoty
A pseudo random value between min (or 0) and max (or RAND_MAX, inclusive).
ChangeLog
| Verzia | Popis |
|---|---|
| Since 3.0.7 | 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. |
Príklady
Example#1 rand() example
<?php
echo rand() . "\n";
echo rand() . "\n";
echo rand(5, 15);
?>
Výstup horeuvedeného príkladu bude niečo podobné tomuto:
7771 22264 11