Piwik\Common::unsanitizeInputValues PHP Method

    public static function unsanitizeInputValues($value)
    {
        if (is_array($value)) {
            $result = array();
            foreach ($value as $key => $arrayValue) {
                $result[$key] = self::unsanitizeInputValues($arrayValue);
            }
            return $result;
        } else {
            return self::unsanitizeInputValue($value);
        }
    }

 public function getCustomVariables($scope)
 {
     if ($scope == 'visit') {
         $parameter = '_cvar';
     } else {
         $parameter = 'cvar';
     }
     $customVar = Common::unsanitizeInputValues(Common::getRequestVar($parameter, '', 'json', $this->params));
     if (!is_array($customVar)) {
         return array();
     }
     $customVariables = array();
     foreach ($customVar as $id => $keyValue) {
         $id = (int) $id;
         if ($id < 1 || $id > Tracker::MAX_CUSTOM_VARIABLES || count($keyValue) != 2 || !is_string($keyValue[0]) && !is_numeric($keyValue[0])) {
             Common::printDebug("Invalid custom variables detected (id={$id})");
             continue;
         }
         if (strlen($keyValue[1]) == 0) {
             $keyValue[1] = "";
         }
         // We keep in the URL when Custom Variable have empty names
         // and values, as it means they can be deleted server side
         $key = self::truncateCustomVariable($keyValue[0]);
         $value = self::truncateCustomVariable($keyValue[1]);
         $customVariables['custom_var_k' . $id] = $key;
         $customVariables['custom_var_v' . $id] = $value;
     }
     return $customVariables;
 }