XSLTProcessor->registerPHPFunctions()

add a note User Contributed Notes

mark at thirst dot org
11-Oct-2006 10:25


Ritch said "If you wish to use a function from inside a class use the double colon (::) notation..."   This worked in 5.0.4 but no longer works in 5.1.6.

franp at free dot fr
03-Sep-2006 04:45


Note that if you want your output to validate against some xhtml dtd, you must add the following attribute to the xsl:stylesheet element of the xslt stylesheet :

exclude-result-prefixes="php".



Otherwise, you get an "invalid attribute xmlns:php" error.

taylorbarstow at that google mail thingy
26-May-2006 08:33


Add-on to my previous note (below) about returning nodesets to XSLT from PHP functions:



You don't have to return a DOMDocument, DOMElement works just as well.  Plus, retuning a DOMElement gets around the problem of discarding the root node which I discuss below and which is also touched on by "Ingram".

heinemann dot juergen at hjcms dot de
09-Mar-2006 06:23


You can find mor Examples at PHP Sources php-5.*/ext/xsl/tests

<?php



$xform = <<<EOT

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

<xsl:stylesheet version="1.0"

    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

    xmlns:php="http://php.net/xsl"

    xsl:extension-element-prefixes="php"

>

<xsl:output method="xml" indent="yes" encoding="utf-8" />

<xsl:namespace-alias stylesheet-prefix="php" result-prefix="xsl" />

<xsl:template match="root">

<html>

<head>

    <title>Dateformat</title>

</head>

<body>

<xsl:for-each select="datenode">

    <li>

        <xsl:value-of select="php:functionString('convertDate', . )" />

    </li>

    </xsl:for-each>

</body>

</html>

</xsl:template>

</xsl:stylesheet>

EOT;



function convertDate( $i )

{

    setlocale( LC_TIME, 'de_DE' );

    return utf8_encode( strftime( '%B %d %A %Y %H:%M:%S CET', $i ) );

}



$xsl = new XSLTProcessor;

$xsl->registerPHPFunctions();

$xsl->setParameter( 'DOCTYPE', 'PUBLIC', 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd' );

$xsl->setParameter( 'html', 'xmlns', 'http://www.w3.org/1999/xhtml' );



$xdom = new DomDocument( '1.0', 'utf-8' );

$xdom->loadXML( $xform );



$xsl->importStyleSheet( $xdom );

unset( $xdom );



$dom = new DomDocument( '1.0', 'utf-8' );

$r = $dom->appendChild( $dom->createElement( 'root' ) );

foreach ( range( 1, 12 ) AS $i ) {

    $r->appendChild( $dom->createElement( 'datenode', mktime( date('G'), date('i'), date('s'), $i, date('d'), date('Y') ) ) );

}



header( "Content-Type: text/html; charset=utf-8;" );

header( "Content-Encoding: utf-8" );

echo $xsl->transformToXML( $dom );



?>

Ingram
01-Mar-2006 04:33


Upon testing returning of a nodeset contributed by



taylorbarstow at that google mail thingy



(which works excellently, TY!)



I found that with using:



===

"Presumably, it's worth creating a template to do the discard:



<xsl:template select="*" mode="discardRoot">

   <xsl:apply-templates select="./*" />

</xsl:template>



Which you can call like so:



<xsl:apply-templates select="php:function('getNodeSet')" mode="discardRoot" /> "

===



I could only output the text and not any of the tags after applying templates - i.e. it stripped all elements around text.



Instead using:



===

<xsl:template match="/">

   <xsl:for-each select="php:function('getNodeSet')" />

     <xsl:apply-templates />

   </xsl:for-each>

</xsl:template>



which effectively discards the root node. 

===



Worked fine and allowed me to apply-templates without problem on the returned nodeset.

hopeseekr at gmail dot com
02-Feb-2006 04:17


One of the peskiest things I had problems with was encoding URL parameters.  I mean, pretend you want to populate a link with "search+terms" instead of just "search terms".  I was including two seperate URLs in the XML and that was ludicrous. 



Below is a far more elegant PHP+XSLT solution.  You will also see it uses two *undocumented* features of registerPHPFunctions(), namely php:functionString() and the passing of parameters to the function.  I figured this out by trial and error; I really hope this note helps you as it *greatly* expands the power of php functions in XSLT!



<?php

/* --- XML input --- */

<search_results>

   <query>concert tickets</query>

</search_results>



/* --- XSL code --- */

<!-- Display query -->

<xsl:template match="search_results">

   <!-- Get URL-encoded string via PHP -->

   <xsl:variable name="safeurl" as="xs:string" select="php:functionString('urlencode', query)" />

   <p>Your search for <em><xsl:value-of select="query"/></em> can be continued at <a href="http://www.tixtix.com/search.php?q={$safeurl}">our search engine</a></p>

</xsl:template>



/* --- XHTML output --- */

<p>Your search for <em>concert tickets</em> can be continued at <a href="http://www.tixtix.com/search.php?q=space+cowboy">our search engine</a></p>

?>



Cool, huh?

taylorbarstow at that google mail thingy
01-Dec-2005 11:14


From a PHP function, you can pass a nodeset back to XSL using a DOMDocument.  For example:



<?php



function getNodeSet() {

   $xml = 

       "<test>" .

       "<a-node>This is a node</a-node>" .

       "<a-node>This is another node</a-node>" .

       "</test>";

   $doc = new DOMDocument;

   $doc->loadXml($xml);

   return $doc;

}



?>



The only problem I've found is that the root level node in your returned DOM document acts like the root level node of your original.   SO, it's easy to introduce an infinite loop like so:



<xsl:template match="/">

   <xsl:apply-templates select="php:function('getNodeSet')" />

</xsl:template>



To avoid this, I've been using a construct like:



<xsl:template match="/">

   <xsl:for-each select="php:function('getNodeSet')" />

      <xsl:apply-templates />

   </xsl:for-each>

</xsl:template>



which effectively discards the root node.  Presumably, it's worth creating a template to do the discard:



<xsl:template select="*" mode="discardRoot">

   <xsl:apply-templates select="./*" />

</xsl:template>



Which you can call like so:



<xsl:apply-templates select="php:function('getNodeSet')" mode="discardRoot" />

Ritch at Bugsoftware dot co dot uk
22-Jun-2005 06:18


If you wish to use a function from inside a class use the double colon (::) notation, for example;



php:functionString('classname::function')



The funtion is fired off as a static and as such acts like a function in the global namespace.

benbarnett
04-Mar-2005 08:34


You can use the php:functionString() in the XSL, which will automatically convert output to a string!

zac at zacbowling dot com
27-Oct-2004 04:48


One thing I have told a lot of people to do if they are having 

issues with this function is to check for any 'xmlns' attributes 

that get generated and added to your xml pages by some 

types of popular software. 



<?php 

$file = "http://data.map***.net/m***ck.asmx/GetMessages?IMEI=$id";



$docxml = file_get_contents($file);



//You may have to do something like this where 

//I remove any instance of xmlns tags that get

//returned by my ASP.NET SOAP responses.



$docxml = 

 str_replace("xmlns=\"http://data.map***.net/m***ck.asmx?WSDL\"",

  "",$docxml);



$xslt = new xsltProcessor;



//You don't remove them then this function will blow up. 

$xslt->registerPHPFunctions();

$xslt->importStyleSheet(DomDocument::load('../xsl/message.xsl'));

print $xslt->transformToXML(DomDocument::loadXML($docxml));



?>



Also a few cool tricks with this function is that you can call 

built in PHP functions. For example:



<xsl:value-of 

  select="php:function('nl2br',string(MessageContent/Message))" 

  disable-output-escaping="yes"/>



That XSL value will now return your normal string but replace

all your new line charactors in your xml with '<br />'s.



Also note the 'disable-output-escaping="yes"' statement. If 

you don't call this, then the output of that bind will be ran 

thru basicly a "htmlencode()" type function. 



Last but not least, take a look at the 'string()' function I 

called in XSL before passing it back. That is because without 

calling that, when it runs it will try and pass the node object, 

and not its value (which is what you most likely only want).



This function is very awsome and could lead to some very 

interesting code development. Skins could be loaded 

remotely. You could write an RSS viewer in PHP without much 

code. You could parse XHTML pages into another view (either 

localy or remotely). Then you can take that same XML 

content and throw it against ASP.NET, Java, or even a 

command line processing tool using that same exact XSL 

style sheet and generate the front ends for you page without 

much change. I'm very excited. 



Happy codding.

junkmail at eighteyes dot com
09-Oct-2004 05:52


When writing a stylesheet that uses a callback function be sure to include a namespace declaration for php, as follows: 



<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

xmlns:php="http://php.net/xsl" version='1.0'>

begemot at php dot com dot ua
28-Sep-2004 09:24


I think it help  your.

<?php



function dateLang () {

        return strftime("%A");

}



$xsl = new DomDocument();

$xsl->load("datetime.xsl");

$inputdom = new DomDocument();

$inputdom->load("today.xml");



$proc = new XsltProcessor();

$proc->registerPhpFunctions();



// Load the documents and process using $xslt

$xsl = $proc->importStylesheet($xsl);



/* transform and output the xml document */

$newdom = $proc->transformToDoc($inputdom);



print $newdom->saveXML();



?>



Here's the XSLT stylesheet, datetime.xsl, that will call that function:



<?xml version="1.0" encoding="iso-8859-1" ?>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:php="http://php.net/xsl">

<xsl:template match="/">

  <xsl:value-of select="php:function('dateLang')" />

</xsl:template>

</xsl:stylesheet>



And here's an absolute minimal XML file, today.xml, to pass through the stylesheet (although articles.xml would achieve the same result):



<?xml version="1.0" encoding="iso-8859-1" ?>

<today></today>

zac at zacbowling dot com
27-Aug-2004 12:48


One thing to note about this function. A lot of values need to be converted to a XSLT string using the "string()" function in XLS before you pass them to your functions, and when you return them make sure that if they are strings that you call the "strval()" in php before doing so. This saved me hours. 



Hope that helps.



Zac Bowling

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