Returns the list of classes to be used by a meta box.
Parameters
$box_id
string
Required
Meta box ID (used in the "id" attribute for the meta box).
$screen_id
string
Required
The screen on which the meta box is shown.
Return
string Space-separated string of class names.
Source
File: wp-admin/includes/post.php.
View all references
function postbox_classes( $box_id, $screen_id ) {
if ( isset( $_GET["edit"] ) && $_GET["edit"] == $box_id ) {
$classes = array( "" );
} elseif ( get_user_option( "closedpostboxes_" . $screen_id ) ) {
$closed = get_user_option( "closedpostboxes_" . $screen_id );
if ( ! is_array( $closed ) ) {
$classes = array( "" );
} else {
$classes = in_array( $box_id, $closed, true ) ? array( "closed" ) : array( "" );
}
} else {
$classes = array( "" );
}
/**
* Filters the postbox classes for a specific screen and box ID combo.
*
* The dynamic portions of the hook name, `$screen_id` and `$box_id`, refer to
* the screen ID and meta box ID, respectively.
*
* @since 3.2.0
*
* @param string[] $classes An array of postbox classes.
*/
$classes = apply_filters( "postbox_classes_{$screen_id}_{$box_id}", $classes );
return implode( " ", $classes );
}