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<?php final class DbConnection { private $dsn; private $initialized = false; public function __construct($dsn) { $this->dsn = $dsn; } private function init() { $this->initialized = true; // socket stuff happens here, much like with PDO } public function query($queryString) { $this->initialized || $this->init(); // irrelevant from here on return ['query' => $queryString, 'dsn' => $this->dsn]; } } $db_conn = new DbConnection('mysql://something'); var_dump( $db_conn, $db_conn->query('SELECT * FROM foo'), $db_conn->query('SELECT * FROM bar') );