APF_Demo_PageMetaBox__WithFormSection::validate PHP Method

Alternatively you can use validation_{class name}() predefined callback method.

public validate ( $aNewOptions, $aOldOptions, $oAdminPage, $aSubmitInfo )

    public function validate($aNewOptions, $aOldOptions, $oAdminPage, $aSubmitInfo)
    {
        return $aNewOptions;
    }

APF_Demo_PageMetaBox__WithFormSection