class monster{
    private $id = 0;
    private $name = "";
    private $baseLevel = 0;
    private $attack = 0;
    private $defense = 0;
    private $baseEXP = 0;
    private $dropType = 0;
    private $dropNum = 0;
    function __construct($a,$b,$c,$d,$e,$f,$g,$h){
    *   self::$id=$a;
        self::$name = $b;
        self::$baseLevel = $c;
        self::$attack = $d;
        self::$defense = $e;
        self::$baseEXP = $f;
        self::$dropType = $g;
        self::$dropNum = $h;
    }
}

我无法弄清楚导致它的原因,以下类(同一文件)返回相同的错误.

class item{
    private $id = 0;
    private $name = "";
    private $type = 0; #0-weapon,1-armor,2-charm,3-ability
    private $ability = 0;
    private $desc = "";
    private $cost = 0;
    function __construct($a,$f){
        self::$id=$a;
        self::$name=$b;
        self::$type=$c;
        self::$ability=$d;
        self::$desc=$e;
        self::$cost = $f;
    }
}

你碰巧知道是什么导致错误或我如何解决它？