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<?php
/**
* PHP version 5
*
* @copyright 2014 Braintree, a division of PayPal, Inc.
*/
/**
* Generates XML output from arrays using PHP's
* built-in XMLWriter
*
* @copyright 2014 Braintree, a division of PayPal, Inc.
*/
class Braintree_Xml_Generator
{
/**
* arrays passed to this method should have a single root element
* with an array as its value
* @param array $aData the array of data
* @return var XML string
*/
public static function arrayToXml($aData)
{
$aData = Braintree_Util::camelCaseToDelimiterArray($aData, '-');
// set up the XMLWriter
$writer = new XMLWriter();
$writer->openMemory();
$writer->setIndent(true);
$writer->setIndentString(' ');
$writer->startDocument('1.0', 'UTF-8');
// get the root element name
$aKeys = array_keys($aData);
$rootElementName = $aKeys[0];
// open the root element
$writer->startElement($rootElementName);
// create the body
self::_createElementsFromArray($writer, $aData[$rootElementName], $rootElementName);
// close the root element and document
$writer->endElement();
$writer->endDocument();
// send the output as string
return $writer->outputMemory();
}
/**
* Construct XML elements with attributes from an associative array.
*
* @access protected
* @static
* @param object $writer XMLWriter object
* @param array $aData contains attributes and values
* @return none
*/
private static function _createElementsFromArray(&$writer, $aData)
{
if (!is_array($aData)) {
if (is_bool($aData)) {
$writer->text($aData ? 'true' : 'false');
} else {
$writer->text($aData);
}
return;
}
foreach ($aData AS $elementName => $element) {
// handle child elements
$writer->startElement($elementName);
if (is_array($element)) {
if (array_key_exists(0, $element) || empty($element)) {
$writer->writeAttribute('type', 'array');
foreach ($element AS $ignored => $itemInArray) {
$writer->startElement('item');
self::_createElementsFromArray($writer, $itemInArray);
$writer->endElement();
}
}
else {
self::_createElementsFromArray($writer, $element);
}
} else {
// generate attributes as needed
$attribute = self::_generateXmlAttribute($element);
if (is_array($attribute)) {
$writer->writeAttribute($attribute[0], $attribute[1]);
$element = $attribute[2];
}
$writer->text($element);
}
$writer->endElement();
}
}
/**
* convert passed data into an array of attributeType, attributeName, and value
* dates sent as DateTime objects will be converted to strings
* @access protected
* @param mixed $value
* @return array attributes and element value
*/
private static function _generateXmlAttribute($value)
{
if ($value instanceof DateTime) {
return array('type', 'datetime', self::_dateTimeToXmlTimestamp($value));
}
if (is_int($value)) {
return array('type', 'integer', $value);
}
if (is_bool($value)) {
return array('type', 'boolean', ($value ? 'true' : 'false'));
}
if ($value === NULL) {
return array('nil', 'true', $value);
}
}
/**
* converts datetime back to xml schema format
* @access protected
* @param object $dateTime
* @return var XML schema formatted timestamp
*/
private static function _dateTimeToXmlTimestamp($dateTime)
{
$dateTime->setTimeZone(new DateTimeZone('UTC'));
return ($dateTime->format('Y-m-d\TH:i:s') . 'Z');
}
private static function _castDateTime($string)
{
try {
if (empty($string)) {
return false;
}
$dateTime = new DateTime($string);
return self::_dateTimeToXmlTimestamp($dateTime);
} catch (Exception $e) {
// not a datetime
return false;
}
}
}