[PHP] OO in PHP5.0 - Referencing Object or not?!

[Raffael Wannenmacher]

hello together
look at the following code ...
why is this ..
-- code start
       if ( is_object($this->getManagerObject()->getDataFieldManager()) )
       {
           for ( $j = 0; $j < 
$this->getManagerObject()->getDataFieldManager()->getCount(); $j++ )
           {
               if ( 
$this->getManagerObject()->getDataFieldManager()->m_objData[$j]['GI_ID'] 
== $this->getID() )
               {
                   $l_objDataField = new GalleryDataField(
                       $this->getManagerObject()->getDataFieldManager(),
                       
$this->getManagerObject()->getDataFieldManager()->m_objData[$j]
                   );

                   $l_objDataField->generateXML();
                   $l_strData .= $l_objDataField->getXML();
                   unset($l_objDataField);
               }
           }
       }
-- code end
.. about 2 seconds slower than this ..
-- code start
       $l_objDataFieldManager = 
$this->getManagerObject()->getDataFieldManager();

       if ( is_object( $l_objDataFieldManager ) )
       {
           for ( $j = 0; $j < $l_objDataFieldManager->getCount(); $j++ )
           {
               if ( $l_objDataFieldManager->m_objData[$j]['GI_ID'] == 
$this->getID() )
               {
                   $l_objDataField = new GalleryDataField(
                       $l_objDataFieldManager,
                       $l_objDataFieldManager->m_objData[$j]
                   );

                   $l_objDataField->generateXML();
                   $l_strData .= $l_objDataField->getXML();
                   unset($l_objDataField);
               }
           }
       }
       unset($l_objDataFieldManager);
-- code end
???
i just read, that objects in php 5 automatically returned as reference? 
in my code it doesn't seems like that!!

ps: variable m_objData contains a lot of data from a mysql db
thanks for answers.
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