add custom column to posts display in admin

// ONLY MOVIE CUSTOM TYPE POSTS
add_filter('manage_trip_posts_columns', 'ST4_columns_head_only_movies', 10);
add_action('manage_trip_posts_custom_column', 'ST4_columns_content_only_movies', 10, 2);

// CREATE TWO FUNCTIONS TO HANDLE THE COLUMN
function ST4_columns_head_only_movies($defaults) {
    $defaults['trip-type'] = 'Trip Type';
    return $defaults;
}
function ST4_columns_content_only_movies($column_name, $post_ID) {
    if ($column_name == 'trip-type') {
        // show content of 'directors_name' column
        echo the_field('trip-type');
    }
}