Description:
------------
Implementing a Composite Pattern I get an unexpected 
recursion. If I remove the &-Operator in the aPart::addChild() it 
works. Further comments are made in the code: 

Reproduce code:
---------------
#!/usr/local/bin/php
<?php

class aPart
{
	var $mChildren;
	var $mName;

	function aPart($name)
	{
		$this->mName     = $name;
		$this->mChildren = array();
	}
	function addChild(&$child)
	{
		$this->mChildren[] =& $child;
	}
	function showParts($indent='')
	{
        echo $indent . $this->mName . "\n";
		for ($i = 0;$i < sizeof($this->mChildren);$i++) {
			$this->mChildren[$i]->showParts($indent . '   ');
		}
	}
}

$arrParts = array('bar','baz');

$objP =& new aPart('foo'); // normally i read a template File
$objP1 = $objP; // make Copy - to avoid filesystem Operation!
$objP2 = $objP; // too
$objP1->mName = $arrParts[0]; // assign bar
$objP2->mName = $arrParts[1]; // assing baz
$objP->addChild($objP1); // Add Component 1
$objP->addChild($objP2); // Add Component 2
$objP->showParts(); // show the tree
/*  Prints as expected:
foo
   bar
   baz
*/
// cleanup
unset($objP);
unset($objP1);
unset($objP2);

// try doing the above it another way
$objP =& new aPart('foo');
for ($i=0;$i<sizeof($arrParts); $i++) {
    $objP1 = $objP; // I expected a Copy here :-(
    $objP1->mName = $arrParts[$i];
    $objP->addChild($objP1);
}
$objP->showParts();// Recursion !!!


?>

Expected result:
----------------
Read the comments in the script: 
foo 
   bar 
   baz 

Actual result:
--------------
In the second example i'am getting an recursion 
foo 
   baz 
      baz 
         baz 
            baz 
              .....