PHP mt_srand function

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mt_srand

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

Seeds the random number generator with
seed.
Since PHP 4.2.0, the seed
becomes optional and defaults to a random value if omitted.

Example 1. mt_srand() example

// seed with microseconds
function make_seed()
{
    list($usec, $sec) = explode(' ', microtime());
    return (float) $sec + ((float) $usec * 100000);
}
mt_srand(make_seed());
$randval = mt_rand();

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.

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