[PHP] Array: how to find a parent key when using a child key?

[Scott Fletcher]

I'm using the recursive function and it use the foreach() loop.  I can
figure out how to use the current key but I could not figure out how to use
the parent's key.  Can anyone point out to what I'm missing here?

Just look at the "//Parent Key - How??" comment in the script...    I'm not
sure what php function that can allow us to walk up the array like
array_walk() for example.  Thanks...

[code]
$array = array
(
  'NEWSFEED' => array
  (
    '0' => array
    (
      'MESSAGE' => array
      (
        '0' => array
        (
          'COMMENT' => array
          (
            '0' => array
            (
              'VALUE' => 'Comment #1'
            )
          )
        ),
        '1' => array
        (
          'COMMENT' => array
          (
            '0' => array
            (
              'VALUE' => 'Comment #2'
            )
          )
        )
      )
    )
  )
);

  function GetXmlStr($tree)
  {
     $branch_level = 0;  //Tree's branches level...

     XmlTreeDecompile($tree, $branch_level);

     return htmlentities($str1);
  }
  function XmlTreeDecompile($tree, $branch_level)
  {
     $branch_level++;

     foreach($tree as $key => $value)
     {
        if ($branch_level % 2 != 0) {  //xml name-tag counter...
           if(!(is_array($value))) {
              echo str_repeat("
",$branch_level)."<".$key.">".$value."</".$key.">"."\r\n";
           } else {
              echo str_repeat(" ",$branch_level)."<".$key.">"."\r\n";
              XmlTreeDecompile($value, $branch_level);
              echo str_repeat(" ",$branch_level)."</".$key.">"."\r\n";

              $str1 = $key;
           }
        } else {  //Xml tag's name...
           //echo $key." #<br>";
           if ($key != 0) {
              //Parent Key - How??

              echo str_repeat(" ",($branch_level-1))."</MESSAGE###>"."\r\n";
              echo str_repeat(" ",($branch_level-1))."<MESSAGE###>"."\r\n";
           }
           XmlTreeDecompile($value, $branch_level);
        }
     }
  }

  $xml_string = GetXmlStr($array);

  //echo "\n<br><br>\n".$xml_string;
[/code]

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