我正在尝试更新post meta值，但它不起作用。唯一有效的功能是get\\u post\\u meta和add\\u post\\u meta，但更新根本不起作用。此外，我还尝试使用wpdb->update更改值，但这也行不通。

这是代码。

function rating_system_callback(){

if(  !wp_verify_nonce(  $_POST[\'nonce\'] ,\'star_rating_nonce\' )){
    wp_die(\'No nonce found.\');
}
if(record_check_and_add($_POST)){
    $total_user_voted = get_post_meta( $_POST[\'post_id\'], \'no_of_user_voted\', true );


    if(empty($total_user_voted)){
        add_post_meta($_POST[\'post_id\'], \'no_of_user_voted\', 1, true);
    }
    $new_user = $total_user_voted + 1;
    update_post_meta($_POST[\'post-id\'], \'no_of_user_voted\', \'58\');


    if(empty($total_votes_for_post)){
        add_post_meta($_POST[\'post_id\'], \'total_points_for_post\', $_POST[\'clicked_on\'], true);

    }
    $new_points =  $total_votes_for_post + $_POST[\'clicked_on\'];
    update_post_meta($_POST[\'post-id\'], \'total_points_for_post\',$new_points);

    $whole_avg = round($new_points / $new_user, 1) ;

    $avg = get_post_meta($_POST[\'post_id\'], \'whole_avg\', $whole_avg, true);
    if(empty($avg)){
        add_post_meta($_POST[\'post_id\'], \'whole_avg\', $whole_avg, true);

    }
    update_post_meta($_POST[\'post-id\'], \'whole_avg\',$whole_avg);
    wp_die();
}