Helper::extractValues PHP Method

    public static function extractValues(array $objects, $attribute, $default = null)
    {
        $values = array();
        foreach ($objects as $object) {
            $values[] = CHtml::value($object, $attribute, $default);
        }
        return $values;
    }

 /**
  * Systemic diagnoses shortcode
  *
  * @return string
  */
 public function getSyd()
 {
     return strtolower(Helper::formatList(Helper::extractValues($this->getSystemicDiagnoses(), 'disorder.term')));
 }