How do I append XML together in PHP - php

Question

Whats not known how to do properly is the following...
$attendXml = "";
for ($i=0;$i<count($attendData);$i++) {
$attendXml += assocArrayToXML('row',$attendData[$i]);
}
I have written wrong but I think you see what I am trying to do, the code comes from the following program. Retrieving the organXml works okay, the problem occurs with an array (none associative) containing a number of (associative arrays) that's the problem.
How do I merge the XML of each of the associative arrays into one XML differentiated by 'row'.
function assocArrayToXML($root_element_name,$ar)
{
$xml = new SimpleXMLElement("<?xml version=\"1.0\"?><{$root_element_name}> </{$root_element_name}>");
$f = create_function('$f,$c,$a','
foreach($a as $k=>$v) {
if(is_array($v)) {
$ch=$c->addChild($k);
$f($f,$ch,$v);
} else {
$c->addChild($k,$v);
}
}');
$f($f,$xml,$ar);
return $xml->asXML();
}
// Include Libraries
include('services\OrganisationService.php');
include('services\AttendeeService.php');
// Target Organisation
$organ_id = 1;
// Read Organisation Data
$organServ = new OrganisationService();
$organData = $organServ->getOrganisationByID($organ_id);
$organXml = assocArrayToXML('organisation',$organData);
// Read Attendees Data (For Organisation)
$attendServ = new AttendeeService();
$attendData = $attendServ->getAllActiveAttendeeByOrg($organ_id);
$attendXml = "";
for ($i=0;$i<count($attendData);$i++) {
$attendXml += assocArrayToXML('row',$attendData[$i]);
}
//var_dump($attendData);
header ("Content-Type:text/xml");
echo $attendXml;
?>

Answer 1

You need to separate the creation of a nodes in the tree based on an associative array from the creation of the entire xml document string. I also recommend against using create_function to define a recursive function, and instead consider creating a class for handling the XML rendering.