PDO::ERRMODE_EXCEPTION, PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC, PDO::ATTR_EMULATE_PREPARES => false, ]; try { $pdo = new PDO($dsn, $database_user, $database_pass, $opt); $stmt = $pdo->query("SELECT `domain` FROM `domain`"); $rows = $stmt->fetchAll(PDO::FETCH_ASSOC); while ($row = array_shift($rows)) { $has_object = 1; echo strtolower(trim($row['domain'])) . PHP_EOL; } $stmt = $pdo->query("SELECT `alias_domain` FROM `alias_domain`"); $rows = $stmt->fetchAll(PDO::FETCH_ASSOC); while ($row = array_shift($rows)) { $has_object = 1; echo strtolower(trim($row['alias_domain'])) . PHP_EOL; } if ($has_object == 0) { echo "dummy@domain.local"; } } catch (PDOException $e) { echo "dummy@domain.local"; exit; } ?>