Could you please give me a question about foreach?

Please give me a question about foreach, such as XMLcode & lt ;? Xmlversion & quot; 1.0 & quot; encoding & quot; UTF-8 & quot ;? & Gt; & lt; top & gt; & lt; middle & gt; & lt; bottom & gt; & lt; valu
There is an XML file, for example:

XML code

  
  
      
           
                
     
      8000
                 
     
      8001
                 
     
      8002
             
        
   
  

I want to find the middle first, and the print is similar:
Bottom:
Value1: 8000
Value2: 8001
Value3: 8002
The DOM parsing code is as follows:

PHP code

  $mid=$xml2->getElementsByTagName("middle")->item(0);foreach($mid->childNodes as $v1){        echo $v1->tagName;        foreach($v1->childNodes as $c2){            echo $c2->tagName;            echo $c2->nodeValue;        }    }

It can be printed, but a warning will appear. in The foreach line, it is a parameter problem. how can this problem be solved?

------ Solution --------------------
The same is true.

8000
8001
8002

Four line breaks, not output four teams?