Initializing a class in a constructor?

Question

PHP

Hi everyone there is:

class One extends Two{
public $obj;

public function __construct($param){
    parent::_construct($param);
    $obj = new Three();
}

public function obj_print(){
    var_dump($obj); // NULL
}
}

Why is the class not initialized in the constructor?

Answer 1

In functions use $this->obj instead of $obj
php.net/manual/en/language.oop5.basic.php