訪問抽象類的靜態變量在子類

Question

線：return 'Static hello ' . self::static_user . '...<br />'; 產地：Fatal error: Undefined class constant 'static_user' in ....

注：邏輯可能是愚蠢的，但我只是玩機智的時刻。問題是我如何訪問子類中的抽象類的靜態變量？我可以在子類中使用$this->public_user公開$public_user。

abstract class UserAbstract 
{ 
protected $public_user = null; 
    static protected $static_user = null; 

    public function __construct($name) 
    { 
    $this->public_user = $name; 
     self::$static_user = $name; 
    } 

    abstract static function static_hello(); 
} 

class User extends UserAbstract 
{ 
    static function static_hello() 
    { 
     return 'Static hello ' . self::static_user . '...<br />'; 
    } 
} 

$obj_user = new User('Voodoo'); 
echo $obj_user->static_hello(); 

Answer 1

使用此：

return 'Static hello ' . parent::$static_user . '...<br />';