PHP在类中创建的对象的继承？ [关闭]

I have a class Second in which is initiated through First. I'm trying to access $variable directly, which I should be able to do with $this->variable, however it doesn't seem to work.

class First {
    public $variable;

    public function getSecond() {
        $this->variable = '123';
        $Second = new Second();
        $Second->blah();
    }
}

class Second extends First {
    public function blah() {
        // Trying to access the variable directly, it is not inherited though
        print_r($this->variable . 'test');
    }
}

$First = new First();
$First->getSecond();

Outputs: test, should output 123test?

Note: I made the functions public for testing purposes. I'm really trying to access the variable directly rather than passing it through a __construct.

The instance $Second never reaches the class method getSecond(), so $this->variable is never set to '123'.