BUGFIX PPP-54497 simpleXml fix for & in values

Author: viacheslav diomidov

src/Api/Client.php

@@ -321,10 +321,15 @@ protected function _expandRequestShortSyntax($request, SimpleXMLElement $xml)
     {
         $parts = explode('.', $request);
         $node = $xml;
+        $lastParts = end($parts);
 
         foreach ($parts as $part) {
             @list($name, $value) = explode('=', $part);
-            $node = $node->addChild($name, htmlspecialchars($value));
+            if($part !== $lastParts) {
+                $node = $node->addChild($name);
+            } else {
+                $node->{$name} = (string)$value;
+            }
         }
 
         return $xml->asXML();
@@ -346,7 +351,7 @@ protected function _arrayToXml(array $array, SimpleXMLElement $xml, $parentEl =
             if (is_array($value)) {
                 $this->_arrayToXml($value, $this->_isAssocArray($value) ? $xml->addChild($el) : $xml, $el);
             } else {
-                $xml->addChild($el, htmlspecialchars($value));
+                $xml->{$el} = (string)$value;
             }
         }