postbox_classes() – Returns the list of classes to be used by a meta box.

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Description

Returns the list of classes to be used by a meta box.

Usage

$string = postbox_classes( $box_id, $screen_id );

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.

Returns

string Space-separated string of class names.

Source

File name: wordpress/wp-admin/includes/post.php
Lines:

1 to 28 of 28
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 );
}
 

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