unserialize_var.php

<?php
class Foo {
  public $var1 = '';
  protected $var2 = '';
  private $var3 = '';

  public function setVars($var1, $var2, $var3) {
    $this->var1 = $var1;
    $this->var2 = $var2;
    $this->var3 = $var3;
  }
}

$obj = new Foo();
$obj->setVars('public', 'protected', 'private');

var_dump(unserialize(serialize($obj)));