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PHP XSL transformation doesn't work when matching on an attribute

I am having trouble transforming XSL using PHP. The multiple responses from the PHP server are:

Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet]: Undefined variable in /hermes/bosweb/web169/b1692/ipg.theburgenlandbunchor/Links/beta/example6/email.php on line 42

Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet]: compilation error: file /hermes/bosweb/web169/b1692/ipg.theburgenlandbunchor/Links/beta/example6/email.xsl line 54 element template in /hermes/bosweb/web169/b1692/ipg.theburgenlandbunchor/Links/beta/example6/email.php on line 42

Warning: XSLTProcessor::importStylesheet() [xsltprocessor.importstylesheet]: Failed to compile predicate in /hermes/bosweb/web169/b1692/ipg.theburgenlandbunchor/Links/beta/example6/email.php on line 42

Warning: XSLTProcessor::transformToXml() [xsltprocessor.transformtoxml]: No stylesheet associated to this object in /hermes/bosweb/web169/b1692/ipg.theburgenlandbunchor/Links/beta/example6/email.php on line 47

Warning: XSLTProcessor::transformToXml() [xsltprocessor.transformtoxml]: No stylesheet associated to this object in /hermes/bosweb/web169/b1692/ipg.theburgenlandbunchor/Links/beta/example6/email.php on line 48

Fatal error: XSL transformation failed. in /hermes/bosweb/web169/b1692/ipg.theburgenlandbunchor/Links/beta/example6/email.php on line 51

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Here is my HTML/PHP file (PHP won't execute unless the file has a PHP suffix):

<!DOCTYPE html>

<html lang="en">

<head>
    <title>PHP example 6-Email Contacts</title>
    <meta charset="utf-8"/>
    <meta name="author" content="Alan Varga"/>
    <meta name="description" content="Embed PHP retrieval in HTML"/>
    <meta http-equiv="last-modified" content="Thu, 05 Apr 2012 07:30 CDT"/>
</head>

<body>

    <p>
No clicking necessary, PHP directly in HTML page.<br/>
Example of PHP transformation with parameters thanks to
    <a href="http://www.tonymarston.net/php-mysql/xsl.html">Tony Marston</a>.<br/><br/>
The Hello line demonstrates that PHP is at least working.
    </p>

    <p>

    <?php
        echo("Hello Alan");
    ?>
    <br/><br/>

The links editor is
    <?php
        $xml_doc = new DomDocument;
        $xml_doc->load("contacts.xml");

        $xsl_doc = new DomDocument;
        $xsl_doc->load("email.xsl");

        $xp1 = new XsltProcessor();
        $xp1->importStyleSheet($xsl_doc);

        $params['title'] = "links_editor";
        $xp1->setParameter("", $params);

        $html = $xp1->transformToXML($xml_doc);
        if ($html = $xp1->transformToXML($xml_doc)) {
            echo $html;
        } else {
            trigger_error("XSL transformation failed.", E_USER_ERROR);
        } // if
    ?>
    </p>

</body>
</html>

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Here is the XML data file:

<?xml version="1.0" encoding="utf-8" ?>



<!--
===========================================
stylesheets used to format this datafile:
===========================================
<?xml-stylesheet type="text/xsl"
  href="email.xsl" ?>
-->



<contact_list>

  <metadata>
    <revdate>04/03/2012</revdate>
  </metadata>



  <contacts>
    <contact title="president">
      <name>Tom Steichen</name>
      <email>steichen@rr.triad.com</email>
    </contact>
    <contact title="links_editor">
      <name>Alan Varga</name>
      <email>aevarga@mc.net</email>
    </contact>
  </contacts>



</contact_list>

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Here is the XSL stylesheet:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet  version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="xml"/>



<!--
===========================================
This stylesheet is used to format datafile:
contacts.xml
===========================================
<xsl:stylesheet  version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
-->



<!--
=================================
parameters and global variables
=================================
testing only
<xsl:param name="title" select="'links_editor'"/>

live
<xsl:param name="title"/>

-->

<xsl:param name="title"/>



<!--
=================================
templates
=================================
-->
<xsl:template match="/">
  <xsl:apply-templates select="contact_list/contacts"/>
</xsl:template>



<xsl:template match="contact_list/contacts">
  <xsl:apply-templates select="contact[@title=$title]"/>
</xsl:template>



<xsl:template match="contact[@title=$title]">
  <xsl:variable name="elink">
    <xsl:text>mailto:</xsl:text>
    <xsl:value-of select="email"/>
  </xsl:variable>

  <a href="{$elink}">
      <xsl:value-of select="name" />
  </a>
</xsl:template>

</xsl:stylesheet>

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To prove out that the XML and XSL files are properly formed and that the transformation works properly, I opened the XML file directly after uncommenting the stylesheet name in the XML file and adding the "select" attribute to the "title" parameter in the XSL file. This successfully returned a hyperlink with my email address.

Is this a bug in PHP or the XSL translator, is it a setting that I can ask my PHP administrator to change, or is there an alternate way to code this (perhaps changing the "title" attribute to a child element)?

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