Fix bug in PayPal PHP SDK Core - php

Question

I am having trouble find the problem in figuring out the problem using merchant-sdk-php I found on github. For some reason its throwing this error. I tried looking at the code but I dont under stand it or see the problem.
Fatal error: Call to undefined method stdClass::toXMLString() in /home/content/08/10639508/html/wp-content/plugins/donation-manager/library/vendor/paypal/paypal-sdk-core-php-bc7822a/lib/PPXmlMessage.php on line 89
<?php
/**
* #author
*/
abstract class PPXmlMessage
{
/**
* #return string
*/
public function toSOAP()
{
return $this->toXMLString();
}
/**
* #return string
*/
public function toXMLString()
{
if (count($properties = get_object_vars($this)) >= 2 && array_key_exists('value', $properties)) {
$attributes = array();
foreach (array_keys($properties) as $property) {
if ($property === 'value') continue;
if (($annots = PPUtils::propertyAnnotations($this, $property)) && isset($annots['attribute'])) {
if (($propertyValue = $this->{$property}) === NULL || $propertyValue == NULL) {
$attributes[] = NULL;
continue;
}
$attributes[] = $property . '="' . PPUtils::escapeInvalidXmlCharsRegex($propertyValue) . '"';
}
}
if (count($attributes)) {
return implode(' ', $attributes) . '>' . PPUtils::escapeInvalidXmlCharsRegex($this->value);
}
}
$xml = array();
foreach ($properties as $property => $defaultValue) {
if (($propertyValue = $this->{$property}) === NULL || $propertyValue == NULL) {
continue;
}
if (is_array($defaultValue) || is_array($propertyValue)) {
foreach ($propertyValue as $item) {
if (!is_object($item)) {
$xml[] = $this->buildProperty($property, $item);
}else{
$xml[] = $this->buildProperty($property, $item);
}
}
} else {
$xml[] = $this->buildProperty($property, $propertyValue);
}
}
return implode($xml);
}
/**
* #param string $property
* #param PPXmlMessage|string $value
* #param string $namespace
* #return string
*/
private function buildProperty($property, $value, $namespace = 'ebl')
{
$annotations = PPUtils::propertyAnnotations($this, $property);
if (!empty($annotations['namespace'])) {
$namespace = $annotations['namespace'];
}
if (!empty($annotations['name'])) {
$property = $annotations['name'];
}
$el = '<' . $namespace . ':' . $property;
if (!is_object($value)) {
$el .= '>' . PPUtils::escapeInvalidXmlCharsRegex($value);
} else {
if (substr($value = $value->toXMLString(), 0, 1) === '<' || $value=='') {
$el .= '>' . $value;
} else {
$el .= ' ' . $value;
}
}
return $el . '</' . $namespace . ':' . $property . '>';
}
/**
* #param array $map
* #param string $prefix
*/
public function init(array $map = array(), $prefix = '')
{
if (empty($map)) {
return;
}
if (($first = reset($map)) && !is_array($first) && !is_numeric(key($map))) {
parent::init($map, $prefix);
return;
}
$propertiesMap = PPUtils::objectProperties($this);
$arrayCtr = array();
foreach ($map as $element) {
if (empty($element) || empty($element['name'])) {
continue;
} elseif (!array_key_exists($property = strtolower($element['name']), $propertiesMap)) {
if (!preg_match('~^(.+)[\[\(](\d+)[\]\)]$~', $property, $m)) {
continue;
}
$element['name'] = $m[1];
$element['num'] = $m[2];
}
$element['name'] = $propertiesMap[strtolower($element['name'])];
if(PPUtils::isPropertyArray($this, $element['name'])) {
$arrayCtr[$element['name']] = isset($arrayCtr[$element['name']]) ? ($arrayCtr[$element['name']]+1) : 0;
$element['num'] = $arrayCtr[$element['name']];
}
if (!empty($element["attributes"]) && is_array($element["attributes"])) {
foreach ($element["attributes"] as $key => $val) {
$element["children"][] = array(
'name' => $key,
'text' => $val,
);
}
if (isset($element['text'])) {
$element["children"][] = array(
'name' => 'value',
'text' => $element['text'],
);
}
$this->fillRelation($element['name'], $element);
} elseif (!empty($element['text'])) {
$this->{$element['name']} = $element['text'];
} elseif (!empty($element["children"]) && is_array($element["children"])) {
$this->fillRelation($element['name'], $element);
}
}
}
/**
* #param string $property
* #param array $element
*/
private function fillRelation($property, array $element)
{
if (!class_exists($type = PPUtils::propertyType($this, $property))) {
trigger_error("Class $type not found.", E_USER_NOTICE);
return; // just ignore
}
if (isset($element['num'])) { // array of objects
$this->{$property}[$element['num']] = $item = new $type();
$item->init($element['children']);
} else {
$this->{$property} = new $type();
$this->{$property}->init($element["children"]);
}
}
}

Answer 1

I had this exact same error (with my live application - it worked fine in my test code). I eventually realized that, when I copied over my test code into the live environment and changed my credentials and URLs from the sandbox ones to the live ones ... I somehow deleted a line of code initializing a PaymentDetailsType object before calling SetExpressCheckout. So this error seemed pretty unrelated, but it was just a problem with setting up the objects before making the call to PayPal.

Answer 2

Perchance are you using json_encode/decode on your PaymentDetail record? It seems that PayPal is very particular about the component classes; stdClass (which json_decode generates) won't cut it. Serialize works, but there are warnings about using it.