Pass container object in XSLTProcessor - php

Question

is there any way to pass or bind Container object and call Service object's method in XSLTProcessor. some thing like.
XSLTProcessor::registerFunction(); //in php file.
in xsltStylesheet
<xslt:value-of select="php:function('serviceobject::serviceObjectMethod',string($xsltProcessingVariable))"/>

Answer 1

In "normal" php code you can do something like
<?php
class Foo {
public function __construct($prefix) {
$this->prefix = $prefix;
}
public function myMethod($id) {
return sprintf('%s#%s', $this->prefix, $id);
}
}
$fooA = new Foo('A');
$fooB = new Foo('B');
echo call_user_func_array( array($fooA, 'myMethod'), array('id1') ), "\r\n";
echo call_user_func_array( array($fooB, 'myMethod'), array('id1') ), "\r\n";
i.e. instead of giving call_user_func_array just the name of the function you pass an array($obj, 'methodName') to invoke an instance method.
Unfortunatley that doesn't seem to work with php:function(...) and I haven't found another easy/clean way to do it.
But you could register your objects in a lookup table string_id->object and then use something like
select="php:function('invoke', 'obj1', 'myMethod', string(#param1), string(#param2))"
in your stylesheet. function invoke($objectId, $methodName) now has to find the object that has been registered under $objectId and then invoke the method like in the previous example.
func_get_args() lets you retrieve all parameters passed to a function, even those that are not declared in the function signature. Cut off the first two elements (i.e. $objectId and $methodName) and pass the remaining array as arguments to call_user_func_array.
self-contained example:
<?php
class Foo {
public function __construct($prefix) {
$this->prefix = $prefix;
}
public function myMethod($id) {
return sprintf('%s#%s', $this->prefix, $id);
}
}
function invoke($objectId, $methodname)
{
static $lookup = array();
$args = func_get_args();
if ( is_null($methodname) ) {
$lookup[$objectId] = $args[2];
}
else {
$args = array_slice($args, 2);
return call_user_func_array( array($lookup[$objectId], $methodname), $args);
}
}
// second parameter null -> register object
// sorry, it's just a quick hack
// don't do this in production code, no one will remember after two weeks
invoke('obj1', null, new Foo('A'));
invoke('obj2', null, new Foo('B'));
$proc = new XSLTProcessor();
$proc->registerPHPFunctions();
$proc->importStyleSheet(new SimpleXMLElement( style() ));
echo $proc->transformToXML(new SimpleXMLElement( document() ));
function document() {
return <<<EOB
<doc>
<element id="id1" />
<element id="id2" />
</doc>
EOB;
}
function style() {
return <<<EOB
<?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:output method="text"/>
<xsl:template match="element">
Obj1-<xsl:value-of select="php:function('invoke', 'obj1', 'myMethod', string(#id))"/>
|||
Obj2-<xsl:value-of select="php:function('invoke', 'obj2', 'myMethod', string(#id))"/>
</xsl:template>
</xsl:stylesheet>
EOB;
}
prints
Obj1-A#id1
|||
Obj2-B#id1
Obj1-A#id2
|||
Obj2-B#id2
btw: don't implement your invoke() function like I did in this example. I just failed to come up with a better way to implement a register()/invoke() functionality for this quick example ;-)