(PHP 4, PHP 5, PHP 7)
srand — Seed the random number generator
srand ([ int $seed ] ) : void
Seeds the random number generator with seed
or with a random value if no seed
is given.
Note: There is no need to seed the random number generator with srand() or mt_srand() as this is done automatically.
Note: As of PHP 7.1.0, srand() has been made an alias of mt_srand().
seed
An arbitrary int seed value.
No value is returned.
Version | Description |
---|---|
7.1.0 | srand() has been made an alias of mt_srand(). |
Example #1 srand() example
<?php // seed with microseconds function make_seed() { list($usec, $sec) = explode(' ', microtime()); return $sec + $usec * 1000000; } srand(make_seed()); $randval = rand(); ?>
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https://www.php.net/manual/en/function.srand.php