Php/docs/function.srand
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srand
(PHP 4, PHP 5, PHP 7)
srand — Seed the random number generator
Description
srand
([ int $seed
] ) : void
Seeds the random number generator with seed
or with a random value if no seed is given.
Note:
There is no needto seed the random number generator with srand() or mt_srand() as this is done automatically.
Note:
As of PHP 7.1.0, srand() has been madean alias of mt_srand().
Parameters
seed- An arbitrary int seed value.
Return Values
No value is returned.
Examples
Example #1 srand() example
<?php// seed with microsecondsfunction make_seed(){ list($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
