function __construct($id = -1) { if (self::$conn == Null) { self::$conn = mysqli_connect('localhost', 'root', 'iti', 'GEO'); } if ($id != -1) { $query = "select * from sub_cato where id_cato={$id_cato} and id_sub={$id_sub} limit 1"; $result = mysqli_query(self::$conn, $query); $prod = mysqli_fetch_assoc($result); $this->id_cato = $prod['id_cato']; $this->id_sub = $prod['id_sub']; $this->name_sub = $prod['name_sub']; } }