Symfony\Component\Form\Field::isValid PHP Method

    public function isValid()
    {
        return $this->isBound() ? count($this->errors)==0 : false; // TESTME
    }

 /**
  * Returns whether the field is valid.
  *
  * @return Boolean
  */
 public function isValid()
 {
     if (!parent::isValid()) {
         return false;
     }
     foreach ($this->fields as $field) {
         if (!$field->isValid()) {
             return false;
         }
     }
     return true;
 }