Php/docs/xsl.examples-errors

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Examples
Error handling with libxml error handling functions

Error handling with libxml error handling functions

libxml offers a number of functions for handling errors, which can be employed to capture and deal with errors in XSLT processing.

Example #1 fruits.xml

A valid XML file.

<fruits>
 <fruit>Apple</fruit>
 <fruit>Banana</fruit>
 <fruit>Cherry</fruit>
</fruits>

Example #2 fruits.xsl

Contains an invalid select expression.

<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>

Example #3 Collating and printing errors

The example below captures and displays libxml errors raised when calling XSLTProcessor::importStyleSheet() with a stylesheet containing an error.

<?php$xmldoc = new DOMDocument();$xsldoc = new DOMDocument();$xsl = new XSLTProcessor();$xmldoc->loadXML('fruits.xml');$xsldoc->loadXML('fruits.xsl');libxml_use_internal_errors(true);$result = $xsl->importStyleSheet($xsldoc);if (!$result) { foreach (libxml_get_errors() as $error) { echo "Libxml error: {$error->message}\n"; }}libxml_use_internal_errors(false);if ($result) { echo $xsl->transformToXML($xmldoc);}?>

The above example will output something similar to:

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!'