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srand
Seed the random number generator
(PHP 4, PHP 5)
void srand ( [int seed] )
Seeds the random number generator with seed or with a random value if no seed is given.
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.
ChangeLog
| Version | Description |
|---|---|
| Since 4.2.0 | The seed becomes optional and defaults to a random value if omitted. |
Examples
Example 1162. srand() example
<?php
// seed with microseconds
function make_seed()
{
list($usec, $sec) = explode(' ', microtime());
return (float) $sec + ((float) $usec * 100000);
}
srand(make_seed());
$randval = rand();
?>
See Also
| rand() |
| getrandmax() |
| mt_srand() |