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

mt_srand -- Seed the better random number generator


void mt_srand ( [int seed] )

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()
$usec, $sec) = explode(' ', microtime());
    return (float)
$sec + ((float) $usec * 100000);
$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().

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