code: function getFieldValue($fieldName)
      {
          $name = trim($fieldName);
          if (isset($this->fields)) {
              return ($this->fields[$name]);
          }
          return;
      }
docs: Returns the value of the field with the given name
  
  @param string fieldName
  The field name of the element to return the value of
  
  @return \em string
  The value or undefined, if not found