Description:
------------
---
From manual page: http://php.net/manual/en/class.simplexmliterator.php
---


When under a for-loop and iterating through a SimpleXMLIterator object, merely 
reading from a variable that stores the children being iterated will cause a 
rewind to the beginning of the object within which you are looping.

Test script:
---------------
$xml = new SimpleXMLIterator($xml_str);

$nodes = $nodes_for_lookup = $xml->children();

$n_node = -1;
		
for($nodes->rewind(); $nodes->valid(); $nodes->next()) {
  $node = $nodes->current();
  $n_node++;

  // This rewinds this loop
  $value_to_check = $nodes[$n_node+1];
  
  // This also rewinds the loop
  $value_to_check = $nodes_for_lookup[$n_node+1];

  // This does NOT rewind the loop (expected behavior)
  $nodes_now = $xml->children();
  $value_to_check = $nodes_now[$n_node+1];
}
						

Expected result:
----------------
The loop should NOT be rewound!  Merely reading from the object should not affect 
the iterator's pointer whatsoever.

Actual result:
--------------
The loop is getting rewound due to reading a specific key-based item in the 
iterator object/array.