PHP Generic class constructor

MyClass.php

<?php
/**
 * The important part here isn't the class structure itself, but the 
 * __construct(...) function. This __construct is generic enough to be placed into any
 * data model class that doesn't preprocess its variables,
 * 
 * Even if you want processing on the variables, 
 * but simply want an initial value from the get-go,
 * you can post-process the values after the if($group){...} statement.
 * 
 * This particular class would be able to take objects that look like this:
 * ['myVar1'=> $input1, 'myVar2'=>$input2]
 * or, exclude one value or the other :
 * ['myVar1'=> $input1] or ['myVar2'=>$input2] 
 */

use \InvalidArgumentException;
class MyClass{
    protected $myVar1;
    protected $myVar2;

    public function __construct($obj = null, $ignoreExtraValues = false){
        if($obj){
            foreach (((object)$obj) as $key => $value) {
                if(isset($value) && in_array($key, array_keys(get_object_vars($this)))){
                    $this->$key = $value;
                }else if (!$ignoreExtraValues){
                    throw new InvalidArgumentException(get_class($this).' does not have property '.$key);
                }
            }
        }
    }
}

test.php

<?php
/**
 * This file is really just a demonstration of one possible use of the constructor.
 * using an associative array, we can assign values to the class based on their variable names.
 *
 * Empty constructors are also valid, and nothing will be initialized as the default input is null.
 */
include_once("MyClass.php");
use MyClass;


$sample_variable = new MyClass();

print_r($sample_variable);

$sample_variable = new MyClass([
    'myVar2'=>123
    ]);

print_r($sample_variable);

$sample_variable = new MyClass([
    'myVar2'=>123, 
    'i_dont_want_this_one'=> 'This won\'t throw an error because we turned it off, but it won\'t get added either.'
    ], true);

print_r($sample_variable);

$sample_variable = new MyClass([
    'myVar1'=>123, 
    'i_dont_want_this_one'=> 'This last one throws an error.'
    ]);