Description:
------------
When I create objects which contain a nested pointer back to itself, it cannot be compared with another object for equality.

Error only occurs when the two objects being compared are the same object.

Also, using === for comparison works correctly.



Reproduce code:
---------------
<?php

$thing = new Thing ();
$otherThing = new OtherThing ();

$thing->otherThing = $otherThing;
$otherThing->thing = $thing;

$thing2 = $thing;

if ($thing == $thing2)
  print "equal";
else
  print "not equal";

Class Thing
{
  public $otherThing;
}

Class OtherThing
{
  public $thing;
}
?>

Expected result:
----------------
I expect it to print 'equal'

Actual result:
--------------
Fatal error: Nesting level too deep - recursive dependency? in D:\xampp\htdocs\scraping\test.php on line 11