[英]access to static variable of abstract class in child class
行 : return 'Static hello ' . self::static_user . '...<br />';
return 'Static hello ' . self::static_user . '...<br />';
产生: Fatal error: Undefined class constant 'static_user' in ....
注意:逻辑可能很愚蠢,但我现在只是在玩它。 问题是如何在子类中访问抽象类的静态变量? 我可以在子类中使用$this->public_user
访问public one $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 $obj_user->static_hello();
用这个:
return 'Static hello ' . parent::$static_user . '...<br />';
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