Filters the postbox classes for a specific screen and box ID combo.

The dynamic portions of the hook name, $screen_id and $box_id, refer to the screen ID and meta box ID, respectively.

$classes string[]

An array of postbox classes.

File: wp-admin/includes/post.php. View all references

$classes = apply_filters( "postbox_classes_{$screen_id}_{$box_id}", $classes );