Seeds the random number generator with seed.
// 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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See also rand(), getrandmax(), mt_rand(), mt_srand(), and mt_getrandmax().