Add custom column for custom field

Question

I created a custom field bookcode using the code below. So, how I can add a column for this meta data into my post type manager and make it sortable?

function save_bookcode( $post_id ) {
    if ( wp_is_post_revision( $post_id ) )
        return;
    // save custom field 'bookcode' as CFX+ID
    add_post_meta( $post_id, 'bookcode', 'CFX' . $post_id, true );
}
add_action( 'save_post', 'save_bookcode' );

Answer 1

I adjusted the code for you. You can directly use the code in functions.php file. Here is more reference that can help you to understand more. Link 1 Link 2

// Adding Custom Column
add_filter('manage_stfic_posts_columns', 'ST4_columns_head_only_stfic', 10);
add_action('manage_stfic_posts_custom_column', 'ST4_columns_content_only_stfic', 10, 2);

// CREATE TWO FUNCTIONS TO HANDLE THE COLUMN
function ST4_columns_head_only_stfic($defaults) {
    $defaults['bookcode'] = 'Book Code';
    return $defaults;
}
function ST4_columns_content_only_stfic($column_name, $post_ID) {
    if ($column_name == 'bookcode') {

        // Now you have to garb the meta value and show.            
        $book_code = get_post_meta($post_ID,'bookcode',true);
        echo '<span>'.$book_code.'</span>';
    }
}