srand
(PHP 3, PHP 4 )
srand -- Seed the random number generator
Description
void srand ( [int seed])
Seeds the random number generator with seed. Since PHP 4.2.0,
the seed becomes optional and defaults to a random value
if omitted.
Example 1. 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();
?>
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.
See also: rand(), getrandmax(), and mt_srand().
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