class?studeng { ????public?static?$a?=?0; ????public??function?bb() ????{ ????????self::$a; ????????return?self::$a++; ???????? ????} } //$studeng?=?new?studeng(); //echo?$studeng->bb(); echo?studeng::bb()."<br>"; echo?studeng::bb()."<br>"; echo?studeng::bb()."<br>";