PHP registered functions in XSLT1, how to return a XML fragment with PHP?

Question

I am using PHP with XSL and registerPHPfunctions.

It is ok for return PHP string values with xsl:value-of, but I not know how to return XML fragments from PHP.

Example at XSLT:

 <xsl:template match="table">
     <xsl:copy-of select="php:function('myfunc',.)"/>
 </xsl:template>

Example at PHP:

 function myfunc($x) {return '<table><tr><td>ok</td></tr></table>';}

Result is not XML but a "lt/gt/amp enconded XML". Use of copy-of or value-of at XSL, not modify the return behaviour. It is a cast problem?

PS: even with identity function, I tested, it not returns the XML node,

 function myfunc($x) {return $x;}

There is <xsl:value-of select="php:function('myfunc') disable-output-escaping="yes" /> for that. But to use it is considered bad practice - and its not working with PHP :| ( I tested with 5.3.10 Ubuntu 12.04). I would advice you to create the <xml> nodes in the xsl not in the php functions. But however I don't know your application needs — hek2mgl
– hek2mgl, Commented Mar 4, 2013 at 14:26
Hum... I try disable-output-escaping on my PHP environment and, also, not working... How to submit a "feature request" to PHP community? PHP not have XSLT2 or xQuery, so it is very important to PHP-XML users... Well, for my application I need to return nodes (not only string-values). — Peter Krauss
– Peter Krauss, Commented Mar 4, 2013 at 14:42
You could try to work with <xsl:if> for example to create the xml tree in xsl depending on the return value of a php function — hek2mgl
– hek2mgl, Commented Mar 4, 2013 at 14:52
Here is an existing feature request: bugs.php.net/bug.php?id=36156 — hek2mgl
– hek2mgl, Commented Mar 4, 2013 at 15:00
Possible related: How to filter a select nodeset with a PHP function? — hakre
– hakre, Commented Mar 5, 2013 at 11:18

Francis Avila · Accepted Answer · 2013-03-04 22:00:06Z

2

Just return any subclass of DOMNode:

$xml = '<root/>';
$xsl = <<<'EOL'
<xsl:stylesheet version="1.0" 
     xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
     xmlns:php="http://php.net/xsl">
    <xsl:template match="/root">
        <xsl:copy-of select="php:function('myXMLFunc', .)"/>
    </xsl:template>
</xsl:stylesheet>
EOL;

function myXMLFunc($m) { // $m is always an array of DOMNodes
    $d = new DOMDocument();
    $e = $d->createElement('newroot');
    $e->appendChild($d->createTextNode('inner text'));
    return $e;
}

$xmldoc = DOMDocument::loadXML($xml);
$xsldoc = DOMDocument::loadXML($xsl);

$proc = new XSLTProcessor();
$proc->registerPHPFunctions('myXMLFunc');
$proc->importStyleSheet($xsldoc);

echo $proc->transformToXML($xmldoc);

The above will produce the xml <newroot>inner text</newroot>.

You can also construct your xml with SimpleXMLElement and convert to a DOM tree with dom_import_simplexml(), which you can then return. Using SimpleXML to construct xml is usually much less painful.

edited Mar 4, 2013 at 22:00

answered Mar 4, 2013 at 21:11

Francis Avila

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3 Comments

Peter Krauss Over a year ago

Thanks a lot (!), yor method is "more DOM-explicit". Now and I am studing and comparing (the simplest!) solutions... And I'm curious about identity function: how to return $m in your myXMLFunc($m) function? (and where you see good documentation or tutorials about all this subject?)

Francis Avila Over a year ago

The argument to the php function is always an array (representing a nodeset). You can do return $m[0]. A generic identity function is not possible, since the return value must always be either a single DOMNode (or subclass) or something that can be coerced to a string. It does not seem possible to return a nodeset, or at least the obvious ways (array or DOMNodeList) don't work. You can emulate nodesets with a container element, but you must discard it on the XSLT side.

Francis Avila Over a year ago

A note, this feature (exposing php methods to xslt) is poorly documented and poorly supported, and has much ugliness about it. Rely on it as little as possible.

Peter Krauss · Accepted Answer · 2013-03-04 20:16:58Z

0

OPS, it is some kind of magic! Now the @hek2mgi tip is working!

I am using

 <xsl:template match="table">
  <xsl:copy-of select="php:function('myfunc',.)" disable-output-escaping="yes" />
 </xsl:template>

...I will back here in some days to say something more about "stable solution" and conclusions...

answered Mar 4, 2013 at 20:16

Peter Krauss

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