<?php

class A
{
    protected $abc = 'abc';
}

$arr = array('myObj' => new A());

print_r($arr);
echo "\n\n";
var_export($arr);

Array
(
    [myObj] => A Object
        (
            [abc:protected] => abc
        )

)


array (
  'myObj' => 
  A::__set_state(array(
     'abc' => 'abc',
  )),
)