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PHP Functions

Function: mt_rand

(PHP 3 >= 3.0.6, PHP 4, PHP 5)

mt_rand -- Generate a better random value

Description

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) .

Example 1. mt_rand() example

<?php
echo mt_rand() . "\n";
echo mt_rand() . "\n";

echo mt_rand(5, 15);
?>

The above example will output something similar to:

1604716014
1478613278
6

Note: As of PHP 4.2.0, there is no need to seed the random number generator with srand() or mt_srand() as this is now done automatically.

Note: 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 mt_rand (5, 11) to get a random number between 5 and 15.

Related Function(s)

  • rand()
  • srand()
  • mt_srand()
  • mt_getrandmax()
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