[Q] dom function bug?

<?php
/***************************  START test.php  *************************************************/
  1:  <?php
  2:  function output_node($node, $level=0) {
  3:    switch($node->type) {
  4:      case XML_ELEMENT_NODE:
  5:            for($i=0; $i<$level; $i++)
  6:              echo "  ";
  7:            echo "<".$node->name;
  8:            $attributes = $node->attributes();
  9:            if(is_array($attributes))
 10:              for(reset($attributes); $attrname = key($attributes); next($attributes))
 11:                echo " ".$attrname."=".$node->getattr($attrname);
 12:            echo ">\n";
 13:            $children = $node->children();
 14:            for($i=0; $i < count($children); $i++)
 15:              output_node($children[$i], $level+1);
 16:            for($i=0; $i<$level; $i++)
 17:              echo "  ";
 18:            echo "</".$node->name.">\n";
 19:            break;
 20:      case XML_TEXT_NODE:
 21:            for($i=0; $i<$level; $i++)
 22:              echo "  ";
 23:            echo $node->content;
 24:            break;
 25:      case XML_ENTITY_REF_NODE:
 26:            echo $node->content;
 27:            break;
 28:      case XML_COMMENT_NODE:
 29:            for($i=0; $i<$level; $i++)
 30:              echo "  ";
 31:            echo "<!--".$node->content."-->";
 32:            echo "\n";
 33:            break;
 34:    }
 35:  }
 36:  
 37:  function list_attr($node) {
 38:    $attr = domxml_attributes($node);
 39:    for(reset($attr); $key = key($attr); next($attr)) {
 40:      echo $key."=".$attr[$key]."\n";
 41:    }
 42:  }
 43:  
 44:  $xmlstr = "<?xml version='1.0' standalone='yes'?>
 45:  <!DOCTYPE chapter SYSTEM '/share/sgml/Norman_Walsh/db3xml10/db3xml10.dtd'
 46:  [ <!ENTITY sp \"spanish\">
 47:  ]>
 48:  <chapter language='en'>
 49:      <title language='en'>Title</title>
 50:      <tgroup cols='3'>
 51:          <tbody>
 52:             <row>
 53:              <entry>a2</entry>
 54:              <entry>c2</entry>
 55:          </row>
 56:          </tbody>
 57:      </tgroup>
 58:  </chapter> ";
 59:  
 60:  /* The following code traverses the xml tree node by node
 61:     by using the methods of the xmlnode object
 62:  */
 63:  echo "Test 1: accessing single nodes from php\n";
 64:  if(!$dom = xmldoc($xmlstr)) {
 65:    echo "Error while parsing the document\n";
 66:    exit;
 67:  }
 68:  echo "XML Version: ".$dom->version."\n";
 69:  echo "Standalone: ".$dom->standalone."\n";
 70:  $rootnode = $dom->root();
 71:  output_node($rootnode);
 72:  
 73:  ?>
/***************************  END test.php  *************************************************/

THIS sampe is file from *test/testdom file of PHP 4.0 packeags*.
(REDHAT 6.1  + APACHE 1.3.12 + PHP 4 DSO + LIBXML2.0)

The following is result of test.php

/*********** RESULT OF test.php *******************************************************/
Test 1: accessing single nodes from php
XML Version: 1.0
Standalone: 1
<chapter>                               // (language='en') ATTRIBUTE DISAPPEARED ?????
  
      <title>                           // (language='en') ATTRIBUTE DISAPPEARED ?????
    Title  </title>
  
      <tgroup>                          // (cols='3') ATTRIBUTE DISAPPEARED ?????
    
            <tbody>
      
                 <row>
        
                    <entry>
          a2        </entry>
        
                    <entry>
          c2        </entry>
        
              </row>
      
            </tbody>
    
      </tgroup>
  
</chapter>
/*********** RESULT OF test.php *******************************************************/

problem #1)
    The return value of "node->attributs()" is not ARRAY;   ( 8 line of test.php )
    if i put  var_dump($attributes); at 8 line in test.php, result of var_dump($attributes) is starnge.

problem #2)
    if  i put "$node->parent()" at 7 line in test.php for test, test.php script is die.


sorry for poor english.

<?php
function output_node($node, $level=0) {
  switch($node->type) {
    case XML_ELEMENT_NODE:
          for($i=0; $i<$level; $i++)
            echo "  ";
            $node->parent();
          echo "<".$node->name;
          $attributes = $node->attributes();
          if(is_array($attributes))
            for(reset($attributes); $attrname = key($attributes); next($attributes))
              echo " ".$attrname."=".$node->getattr($attrname);
          echo ">\n";
          $children = $node->children();
          for($i=0; $i < count($children); $i++)
            output_node($children[$i], $level+1);
          for($i=0; $i<$level; $i++)
            echo "  ";
          echo "</".$node->name.">\n";
          break;
    case XML_TEXT_NODE:
          for($i=0; $i<$level; $i++)
            echo "  ";
          echo $node->content;
          break;
    case XML_ENTITY_REF_NODE:
          echo $node->content;
          break;
    case XML_COMMENT_NODE:
          for($i=0; $i<$level; $i++)
            echo "  ";
          echo "<!--".$node->content."-->";
          echo "\n";
          break;
  }
}

function list_attr($node) {
  $attr = domxml_attributes($node);
  for(reset($attr); $key = key($attr); next($attr)) {
    echo $key."=".$attr[$key]."\n";
  }
}

$xmlstr = "<?xml version='1.0' standalone='yes'?>
<!DOCTYPE chapter SYSTEM '/share/sgml/Norman_Walsh/db3xml10/db3xml10.dtd'
[ <!ENTITY sp \"spanish\">
]>
<chapter language='en'>
    <title language='en'>Title</title>
    <tgroup cols='3'>
        <tbody>
           <row>
            <entry>a2</entry>
            <entry>c2</entry>
        </row>
        </tbody>
    </tgroup>
</chapter> ";

/* The following code traverses the xml tree node by node
   by using the methods of the xmlnode object
*/
echo "Test 1: accessing single nodes from php\n";
if(!$dom = xmldoc($xmlstr)) {
  echo "Error while parsing the document\n";
  exit;
}
echo "XML Version: ".$dom->version."\n";
echo "Standalone: ".$dom->standalone."\n";
$rootnode = $dom->root();
output_node($rootnode);

?>