This is more a generic PHP question, but for what it’s worth:
if ( empty( $_SESSION['seed_time'] ) )
$_SESSION['seed_time'] = time();
if ( empty( $_SESSION['seed'] ) || time() > ( $_SESSION['seed_time'] + 30 * MINUTE_IN_SECONDS ) ) {
// Seed session is empty, or session time is older than 30 minutes, generate new seed
$_SESSION['seed'] = $seed = rand();
$_SESSION['seed_time'] = time();
} else {
$seed = $_SESSION['seed'];
}
return "RAND($seed)";
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