(PHP 4, PHP 5, PHP 7)
Seed the better random number generator
void mt_srand ([ int $seed ] )
Seeds the random number generator with seed
or with a random value if no seed
is given.
Note: There is no need to seed the random number generator with srand() or mt_srand() as this is done automatically.
Parameters:
seed
An optional seed value
Returns:
No value is returned.
Changelog:
5.2.1
The Mersenne Twister implementation in PHP now uses a new seeding algorithm by Richard Wagner. Identical seeds no longer produce the same sequence of values they did in previous versions. This behavior is not expected to change again, but it is considered unsafe to rely upon it nonetheless.
Examples:
mt_srand() example
<?php // seed with microseconds function make_seed() { list($usec, $sec) = explode(' ', microtime()); return (float) $sec + ((float) $usec * 100000); } mt_srand(make_seed()); $randval = mt_rand(); ?>
See also:
srand() -
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