Pop\Form\Fields::setField PHP Method

    public function setField($field, $attrib, $value = null)
    {
        if (isset($this->fields[$field])) {
            if (is_string($attrib) && null !== $value) {
                $this->fields[$field][$attrib] = $value;
            } else {
                if (is_array($attrib)) {
                    foreach ($attrib as $k => $v) {
                        $this->fields[$field][$k] = $v;
                    }
                }
            }
        }
        return $this;
    }