srand
(PHP 3, PHP 4, PHP 5)
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();
?>
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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().