Problem Reading XML DOM Element using PHP -

I failed! Here's my problem: I get a DOMElement code:

  $ ref_cell = $ new_row-> childNodes-> Item ($ j);   
 I used the properties of the said code: e  ho $ ref_cell-> nodeValue;  The computer says ... quote:  
  is trying to get non-object property ...   
 I code I'll try:  
 $ ref_cell echo;   
 The computer says ... quote:  
  The purpose of the class of domalement can not be converted into string ...  < / Pre> 
 Can anyone explain this?  
 No insight will be helpful - I am going to remove my face and share my keyboard through monitor ...   
 
 
 It is possible that the line is empty and there is no hair node. I will start by checking to make sure that there is valid material in each level at the cost of the question.