Question

is it possible to easily and quickly “assigning properties of one object to another”

class a {
    public $number_one;
    public $number_two;
    public $number_three;

    function __contruct() {
        //do stuff
    }
}

class b {
    public $my_var;

    function __contruct() {

        $instanc_a = new a();
        extract( $instance ); // but make these extracted object properties of class b????
                              // how? :-(
        echo $this->number_one;
    }
}

Answer 1

You can use get_object_vars to copy the public (only) properties of class a to the current object:

class b {
    public $my_var;

    function __construct() {
        $instanc_a = new a();
        $vars = get_object_vars($instanc_a);
        foreach($vars as $name => $value) {
            $this->$name = $value;
        }

        echo $this->number_one;
    }
}

See it in action.

Note: You have a typo in your code (two cases of “contruct” instead of “construct”) which will prevent things from working as they should.