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<title>Error handling with libxml error handling functions</title>
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<h2 class="title">Error handling with libxml error handling functions</h2>
<p class="para">
libxml offers a number of functions for handling errors, which can be
employed to capture and deal with errors in XSLT processing.
</p>
<p class="para">
<div class="example" id="example-6761">
<p><strong>Example #1 fruits.xml</strong></p>
<div class="example-contents"><p>A valid XML file.</p></div>
<div class="example-contents">
<div class="xmlcode"><pre class="xmlcode"><fruits>
<fruit>Apple</fruit>
<fruit>Banana</fruit>
<fruit>Cherry</fruit>
</fruits></pre>
</div>
</div>
</div>
<div class="example" id="example-6762">
<p><strong>Example #2 fruits.xsl</strong></p>
<div class="example-contents"><p>Contains an invalid select expression.</p></div>
<div class="example-contents">
<div class="xmlcode"><pre class="xmlcode"><xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" encoding="utf-8" indent="no"/>
<xsl:template match="fruits">
<ul>
<xsl:apply-templates/>
</ul>
</xsl:template>
<xsl:template match="fruit">
<li><xsl:value-of select="THIS IS A DELIBERATE ERROR!"/></li>
</xsl:template>
</xsl:stylesheet></pre>
</div>
</div>
</div>
<div class="example" id="example-6763">
<p><strong>Example #3 Collating and printing errors</strong></p>
<div class="example-contents"><p>
The example below captures and displays libxml errors raised when calling
<span class="methodname"><a href="xsltprocessor.importstylesheet.html" class="methodname">XSLTProcessor::importStyleSheet()</a></span> with a
stylesheet containing an error.
</p></div>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br />$xmldoc </span><span style="color: #007700">= new </span><span style="color: #0000BB">DOMDocument</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$xsldoc </span><span style="color: #007700">= new </span><span style="color: #0000BB">DOMDocument</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$xsl </span><span style="color: #007700">= new </span><span style="color: #0000BB">XSLTProcessor</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">$xmldoc</span><span style="color: #007700">-></span><span style="color: #0000BB">loadXML</span><span style="color: #007700">(</span><span style="color: #DD0000">'fruits.xml'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$xsldoc</span><span style="color: #007700">-></span><span style="color: #0000BB">loadXML</span><span style="color: #007700">(</span><span style="color: #DD0000">'fruits.xsl'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">libxml_use_internal_errors</span><span style="color: #007700">(</span><span style="color: #0000BB">true</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">$xsl</span><span style="color: #007700">-></span><span style="color: #0000BB">importStyleSheet</span><span style="color: #007700">(</span><span style="color: #0000BB">$xsldoc</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> foreach (</span><span style="color: #0000BB">libxml_get_errors</span><span style="color: #007700">() as </span><span style="color: #0000BB">$error</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"Libxml error: </span><span style="color: #007700">{</span><span style="color: #0000BB">$error</span><span style="color: #007700">-></span><span style="color: #0000BB">message</span><span style="color: #007700">}</span><span style="color: #DD0000">\n"</span><span style="color: #007700">;<br /> }<br />}<br /></span><span style="color: #0000BB">libxml_use_internal_errors</span><span style="color: #007700">(</span><span style="color: #0000BB">false</span><span style="color: #007700">);<br /><br />if (</span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> echo </span><span style="color: #0000BB">$xsl</span><span style="color: #007700">-></span><span style="color: #0000BB">transformToXML</span><span style="color: #007700">(</span><span style="color: #0000BB">$xmldoc</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output
something similar to:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
Libxml error: Invalid expression
Libxml error: compilation error: file fruits.xsl line 9 element value-of
Libxml error: xsl:value-of : could not compile select expression 'THIS IS A DELIBERATE ERROR!'
</pre></div>
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</p>
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