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.
No value is returned.
- int $seed: An arbitrary integer seed value.
Example #1 mt_srand() example
// seed with microseconds
list($usec, $sec) = explode(' ', microtime());
return $sec + $usec * 1000000;
$randval = mt_rand();
- There is no need to seed the random number generator with srand() or mt_srand() as this is done automatically.
|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.|