Source
File: wp-admin/includes/template.php
function do_accordion_sections( $screen, $context, $object ) {
global $wp_meta_boxes;
wp_enqueue_script( 'accordion' );
if ( empty( $screen ) ) {
$screen = get_current_screen();
} elseif ( is_string( $screen ) ) {
$screen = convert_to_screen( $screen );
}
$page = $screen->id;
$hidden = get_hidden_meta_boxes( $screen );
?>
<div id="side-sortables" class="accordion-container">
<ul class="outer-border">
<?php
$i = 0;
$first_open = false;
if ( isset( $wp_meta_boxes[ $page ][ $context ] ) ) {
foreach ( array( 'high', 'core', 'default', 'low' ) as $priority ) {
if ( isset( $wp_meta_boxes[ $page ][ $context ][ $priority ] ) ) {
foreach ( $wp_meta_boxes[ $page ][ $context ][ $priority ] as $box ) {
if ( false === $box || ! $box['title'] ) {
continue;
}
$i++;
$hidden_class = in_array( $box['id'], $hidden, true ) ? 'hide-if-js' : '';
$open_class = '';
if ( ! $first_open && empty( $hidden_class ) ) {
$first_open = true;
$open_class = 'open';
}
?>
<li class="control-section accordion-section <?php echo $hidden_class; ?> <?php echo $open_class; ?> <?php echo esc_attr( $box['id'] ); ?>" id="<?php echo esc_attr( $box['id'] ); ?>">
<h3 class="accordion-section-title hndle" tabindex="0">
<?php echo esc_html( $box['title'] ); ?>
<span class="screen-reader-text"><?php _e( 'Press return or enter to open this section' ); ?></span>
</h3>
<div class="accordion-section-content <?php postbox_classes( $box['id'], $page ); ?>">
<div class="inside">
<?php call_user_func( $box['callback'], $object, $box ); ?>
</div><!-- .inside -->
</div><!-- .accordion-section-content -->
</li><!-- .accordion-section -->
<?php
}
}
}
}
?>
</ul><!-- .outer-border -->
</div><!-- .accordion-container -->
<?php
return $i;
}