srand
(PHP 4, PHP 5, PHP 7, PHP 8)
srand — Seed the random number generator
Description
srand(int
$seed = 0, int $mode = MT_RAND_MT19937): void
Seeds the random number generator with seed
or with a random value if seed is 0.
Note: There is no need to seed the random number generator with srand() or mt_srand() as this is done automatically.
Note: As of PHP 7.1.0, srand() has been made an alias of mt_srand().
Parameters
-
seed -
An arbitrary int seed value.
Return Values
No value is returned.
Examples
Example #1 srand() example
<?php
// seed with microseconds
function make_seed()
{
list($usec, $sec) = explode(' ', microtime());
return $sec + $usec * 1000000;
}
srand(make_seed());
$randval = rand();
?>
See Also
- rand() - Generate a random integer
- getrandmax() - Show largest possible random value
- mt_srand() - Seeds the Mersenne Twister Random Number Generator
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