converting to php5 - xpath troubles

[silkatron]

After a 95% successful convert to php5 dom from php4 domxml I find myself with a rather irritating xpath change which i've been banging my head against the wall with. Let me show you the original php4 code:

 if ( $dom = domxml_open_file( $root."xml/sidebar.xml" ) )
 {
 $context = xpath_new_context( $dom );
 $blocks = xpath_eval( $context, "/sidebar/block[@id=/sidebar/group[@id='$sidebar']/block-ref/@id]" );
 $blocks = $blocks->nodeset;
 $xml .= "<sidebar>";
 while( $block = each( $blocks ) )
 {
 $block = $block[1];
 $context = xpath_new_context( $block );
 $xml .= $dom->dump_node( $block );
 }
 $xml .= "</sidebar>";
 }

I'm basically getting a little lost with the xpath reading the blocks tree. Below is a sample of the xml it is reading:

<sidebar>
 <block id="catno">
 <name>Find HTFR cat number</name>
 <catno/>
 </block>
 <block id="logon">
 <logon/> <!-- xsl stuff -->
 </block>
 <block id="newsite">
 <name>htfr site enhancements</name>
 <p>Let us know what you think of our new site, or of any bugs you may have found.</p>
 <link>Click here to email us</link>
 </block>
</sidebar>

Please can someone help me solve this problem or at least enlighten me about the change in xpath.

[choster]

I don't see any <block-ref>s.

[silkatron]

I managed to work this out in the end
Here is the code I used to achieve the same results:

 $dom->load( $root.'xml/sidebar.xml' );
 
 $xpath = new DomXPath($dom);
 $blocks = $xpath->query( "/sidebar/block[@id=/sidebar/group[@id='$sidebar']/block-ref/@id]" );
 $xml .= "<sidebar>";
 foreach( $blocks as $block )
 {
 $xml .= $dom->saveXML( $block );
 }
 $xml .= "</sidebar>";

Rather simpler code than php4 but was a bugger to work out!