CMB2 Meta Box Code

function cmb_meta_box(array $mitul){
$prefix = '_xx_';
$mitul[] = array(
'id' => 'second-section',
'title' => 'This is Second section',
'object_types' => array('post'),
'fields' => array(
array(
'name' => 'Enter Your Name',
'type' => 'text',
'id' => $prefix.'hkname'
)
)
);
return $mitul;
}
add_filter('cmb2_meta_boxes','cmb_meta_box');