PayPal\Core\PPMessage::init PHP Method

    public function init(array $map = array(), $prefix = '')
    {
        if (empty($map)) {
            return;
        }
        $map = PPUtils::lowerKeys($map);
        foreach (get_object_vars($this) as $property => $defaultValue) {
            if (array_key_exists($propKey = strtolower($prefix . $property), $map) && $this->isBuiltInType($type = PPUtils::propertyType($this, $property))) {
                $type = PPUtils::propertyType($this, $property);
                $this->{$property} = urldecode($map[$propKey]);
                continue;
                // string
            } elseif (!($filtered = PPUtils::filterKeyPrefix($map, $propKey))) {
                continue;
                // NULL
            }
            $type = PPUtils::propertyType($this, $property);
            if (!$this->isBuiltInType($type) && !class_exists($type)) {
                trigger_error("Class {$type} not found.", E_USER_NOTICE);
                continue;
                // just ignore
            }
            if (is_array($defaultValue) || PPUtils::isPropertyArray($this, $property)) {
                // array of objects
                if ($this->isBuiltInType($type)) {
                    // Array of simple types
                    foreach ($filtered as $key => $value) {
                        $this->{$property}[trim($key, "()")] = urldecode($value);
                    }
                } else {
                    // Array of complex objects
                    $delim = '.';
                    for ($i = 0; $itemValues = PPUtils::filterKeyPrefix($filtered, "({$i})"); $i++) {
                        $this->{$property}[$i] = $item = new $type();
                        $item->init(PPUtils::filterKeyPrefix($itemValues, "."));
                        if (array_key_exists("", $itemValues)) {
                            $item->value = urldecode($itemValues[""]);
                        }
                    }
                    // Handle cases where we have a list of objects
                    // with just the value present and all attributes values are null
                    foreach ($filtered as $key => $value) {
                        $idx = trim($key, "()");
                        if (is_numeric($idx) && (is_null($this->{$property}) || !array_key_exists($idx, $this->{$property}))) {
                            $this->{$property}[$idx] = new $type();
                            $this->{$property}[$idx]->value = urldecode($value);
                        }
                    }
                }
            } else {
                // one object
                $this->{$property} = new $type();
                $this->{$property}->init(PPUtils::filterKeyPrefix($filtered, '.'));
                // unprefix
                if (array_key_exists("", $filtered)) {
                    $this->{$property}->value = urldecode($filtered[""]);
                }
            }
        }
    }