Question

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

Note: Logic might be silly but I’m just playing wit it at the moment. Question is how can I access to static variable of abstract class in child class? I can access to public one $public_user with $this->public_user in child class.

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

Use this:

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