如果需要显示“选择选项”值而不是“键”，则必须为此使用选项回调函数。像这样，

add_action( \'cmb2_admin_init\', \'your_function_name\' );
function your_function_name() {
    $prefix = \'your_prifix_\';
    /**
     * Sample metabox to demonstrate each field type included
     */
    $cmb = new_cmb2_box( array(
        \'id\'            => $prefix . \'metabox\',
        \'title\'         => __( \'Title\', \'cmb2\' ),
        \'object_types\'  => array( \'post\' ), // Post type
        \'show_on\' => array( ),
        // \'show_on_cb\' => \'cm_show_if_front_page\', // function should return a bool value
        // \'context\'    => \'normal\',
        // \'priority\'   => \'high\',
        // \'show_names\' => true, // Show field names on the left
        // \'cmb_styles\' => false, // false to disable the CMB stylesheet
        //\'closed\'     => true, // true to keep the metabox closed by default
    ) );

    $cmb->add_field(array(
        \'name\' => __(\'Age\', \'cmb2\'),
        \'id\' => $prefix . \'mpaa\',
        \'type\' => \'select\',
        \'show_option_none\' => true,
        // Use an options callback
        \'options_cb\' => \'show_cat_or_dog_options\',
    ));

} // End of cmb2_admin_init function

function show_cat_or_dog_options() {
    // return a standard options array
    return array(
        \'g\' => __(\'option 1\', \'cmb2\'),
        \'pg\' => __(\'option 2\', \'cmb2\'),
        \'pg13\' => __(\'option 3\', \'cmb2\'),
        \'r\' => __(\'option 4\', \'cmb2\'),
        \'nc17\' => __(\'option 5\', \'cmb2\'),
    );
}

现在，您只需显示select options键和值组合回调函数并获取\\u post\\u meta（）；

$prefix = \'your_prifix_\';
$options = show_cat_or_dog_options();
$key = get_post_meta( get_the_ID(), $prefix . \'mpaa\', true );
$name = $options[ $key ];

echo \'Select Options Key/ID => \' . $key . \'<br />\';
echo \'Select Options Name/Value => \' . $name . \'<br />\';