Passing Parameters to an XSLT StylesheetIf you need to pass data from the PHP script to the XSLT stylesheet, PHP's xslt_process() function can be used to pass an associative arrays of parameters to the XSLT stylesheet. You'll remember that the xslt_process() function can accept an array containing parameter-value pairs as an optional sixth argument. These parameters can be passed on to the stylesheet and used within template rules. Consider Listing 4.8, which creates an associative array named $params, and stores two elements containing the page title and current date in it. This associative array is then passed on to the stylesheet via the xslt_process() function.
Listing 4.8 Passing Parameters to an XSLT Stylesheet
<?php
// set the filenames
$xml_file = "aloha.xml";
$xslt_file = "aloha.xsl";
// set up the parameters
$params = array("today" => date
("d M Y", mktime()), "page_title" => "Aloha!");
// include an empty array for arguments
(otherwise XSLT tends to break - hopefully
corrected in next release)
$arg_buffer = array();
// create the XSLT processor
$xp = xslt_create() or die
("Could not create XSLT processor");
// process the two files
to get the desired output
if($result = xslt_process
($xp, $xml_file, $xslt_file, NULL, $arg_buffer, $params))
{
echo $result;
}
else
{
echo "An error occurred: " . xslt_error($xp) .
"(error code " . xslt_errno($xp) .
")";
}
// free the resources occupied by the handler
xslt_free($xp);
?>
These parameters are now available to the stylesheet and can be used within a template rule via the <xsl:param /> element (see Listing 4.9).
Listing 4.9 Using Passed Parameters in an XSLT Stylesheet<?xml version="1.0"?> <xsl:stylesheet version="1.0" xmlns:xsl= "http://www.w3.org/1999/XSL/Transform"> <!-- define the parameter --> <xsl:param name="page_title"/> <xsl:param name="today"/> <xsl:template match="/"> <l> <head> <!-- use the parameter --> <title><xsl:value-of select="$page_ title" /> Today is <xsl:value-of select="$today" /> </title> </head> <body> <!-- other templates - snip! --> </body> <l> </xsl:template> </xsl:stylesheet> |