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XSLT - pass a parameter inside XSL with PHP

Post date:11/06/2009 - Posted by

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Working in XSLT and PHP integration, one of the most necessary needs a developer necesitates, after XML-XSL integration, is how to pass variable or data inside the XSL script.
Why we necesite it? Well, for example if we do a dynamic Query (in this case XQuery) that use a Record (in this case one elemento of the XML tree), i mean the classic request (GET, POST o something else) but applied to the XSLT.

XML tree example: location.xml <CityLocations> <CityLocation> <CityID>1</CityID> <LocationName>New York</LocationName> </CityLocation> <CityLocation> <CityID>2</CityID> <LocationName>Chicago</LocationName> </CityLocation> </CityLocations>
Now we create the XSL file that execute the XQuery and receive the CityID parameter
Example:location.xsl.php

 
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
    <table width="100%">
      <tr>
		<th>CityId</th>
        <th>LocationName</th>
      </tr>
      <xsl:for-each select="CityLocations/CityLocation[CityID=$CityID]">
      <tr>
        <td><xsl:value-of select="CityID"/></td>
        <td><xsl:value-of select="LocationName"/></td>
      </tr>
      </xsl:for-each>
    </table>
</xsl:template>
</xsl:stylesheet>

And at last we go to create the PHP file that integrates XML and XSL and injects the parameter inside the XSL
Example:location.php

 
 
// ------------Applica un file XSL a un XML In PHP 5  --------------------
$cityLocations = "1";
// Carica il file dati
 
$xml = new DOMDocument("1.0");
$xml->load($_SERVER['DOCUMENT_ROOT'].'/xml/location.xml');
 
// Carica il file stile
$xsl = new DOMDocument("1.0");
$xsl->load($_SERVER['DOCUMENT_ROOT'].'/xslt/location.xsl.php');
// Crea un processore XSLT
$proc = new XSLTProcessor;
// Setta un parametro da trasformare nel file XSL  
$proc->setParameter( '', 'CityID', $cityLocations);   
$proc->importStyleSheet($xsl); // Importa il file xslt
$dom=$proc->transformToDoc($xml);    // Output risultato a documento DOM
$dom->formatOutput=true;
echo  $dom->saveXML($dom->documentElement);  // Invia il risultato a un browser

Final result will be : CityID:1

LocationName:New York

Surely we can use this kind of operation for more complex things.