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mt_rand
(PHP 4, PHP 5)
mt_rand — Generate a better random value
Описание
int mt_rand ( void )
int mt_rand ( int $min , int $max )
Many random number generators of older libcs have dubious or unknown characteristics and are slow. By default, PHP uses the libc random number generator with the rand() function. The mt_rand() function is a drop-in replacement for this. It uses a random number generator with known characteristics using the » Mersenne Twister, which will produce random numbers four times faster than what the average libc rand() provides.
If called without the optional min , max arguments mt_rand() returns a pseudo-random value between 0 and RAND_MAX. If you want a random number between 5 and 15 (inclusive), for example, use mt_rand (5, 15).
Замечание: Начиная с PHP 4.2.0, больше нет необходимости инициализировать генератор случайных чисел функциями srand() или mt_srand(), поскольку теперь это происходит автоматически.
Список параметров
- min
-
Optional lowest value to be returned (default: 0)
- max
-
Optional highest value to be returned (default: RAND_MAX)
Возвращаемые значения
A random integer value between min (or 0) and max (or RAND_MAX, inclusive)
Список изменений
| Версия | Описание |
|---|---|
| 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. |
Примеры
Пример #1 mt_rand() example
<?php
echo mt_rand() . "\n";
echo mt_rand() . "\n";
echo mt_rand(5, 15);
?>
Результатом выполнения данного примера будет что-то подобное:
1604716014 1478613278 6
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