Accessing private members of the same object type

privateVisibilityFromTheOtherObjects.php

<?php
class Foo
{
  private $_property = "Foo";

  public function get()
  {
    return $this->_property;
  }

  public function modifyProperty(Foo $other, $value)
  {
    $other->_property = $value;
  }
}

$foo = new Foo();
$bar = new Foo();

printf("bar _property: %s\n",$bar->get()); // prints: bar _property: Foo
$foo->modifyProperty($bar, "Bar");
printf("bar _property: %s\n",$bar->get()); // prints: bar _property: Bar