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).
Пример 1. rand() example
<?php
echo rand() . "\n";
echo rand() . "\n";
echo rand(5, 15);
?> |
The above example will output something similar to:
|
Замечание: 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.
Замечание: Начиная с PHP 4.2.0, больше нет необходимости инициализировать генератор случайных чисел функциями srand() или mt_srand(), поскольку теперь это происходит автоматически.
Замечание: 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.
Смотрите также: srand(), getrandmax(), and mt_rand().