Added LIBXML_NOWARNING to simplexml_load_string calls to suppress PHP 7 warning

Author: mfurlend

lib/AuthorizeNetCP.php

@@ -119,7 +119,7 @@ public function __construct($response, $delimiter, $encap_char, $custom_fields)
             // If it's an XML response
             if (substr($response, 0, 5) == "<?xml") {
 
-                $this->xml = @simplexml_load_string($response);
+                $this->xml = @simplexml_load_string($response, 'SimpleXMLElement', LIBXML_NOWARNING);
                 // Set all fields
                 $this->version              = array_pop(array_slice(explode('"', $response), 1,1));
                 $this->response_code        = (string)$this->xml->ResponseCode;

lib/shared/AuthorizeNetXMLResponse.php

@@ -26,10 +26,10 @@ public function __construct($response)
     {
         $this->response = $response;
         if ($response) {
-            $this->xml = @simplexml_load_string($response);
+            $this->xml = @simplexml_load_string($response,'SimpleXMLElement', LIBXML_NOWARNING);
 
             // Remove namespaces for use with XPath.
-            $this->xpath_xml = @simplexml_load_string(preg_replace('/ xmlns:xsi[^>]+/','',$response));
+            $this->xpath_xml = @simplexml_load_string(preg_replace('/ xmlns:xsi[^>]+/','',$response),'SimpleXMLElement', LIBXML_NOWARNING);
         }
     }
 
@@ -125,4 +125,4 @@ protected function _getElementContents($elementName)
         }
     }
 
-}
+}