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# 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).

範例 1. rand() example
`<?php echo rand() . "\n"; echo rand() . "\n"; echo rand(5, 15); ?>`
The above example will output something similar to:
    7771
    22264
    11

> 注: 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.

> 注: ��PHP 4.2.0 �l�A�z�ݭn�A�ϥ� srand() �� mt_srand() �üƲ�;�Ѻؤl�A�]�o�w�۰ʪ�ѤF�C

> 注: 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.

See also: srand(), getrandmax(), and mt_rand().

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