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[WordPress Plugin] Nav Menu Exporter and Importer / Export and Import nav menus. Requires WordPress Importer plugin.
<?php
/*
Plugin Name: Nav Menu Exporter and Importer
Description: Export and Import nav menus. Requires WordPress Importer plugin
Author: hissy, megumi themes
Version: 0.1
Text Domain: nav-menu-exporter-importer
License: GPL version 2 or later - http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*/
/**
* Exporter
*/
function add_mav_menu_to_export() {
$post_type = get_post_type_object('nav_menu_item');
?>
<p><label><input type="radio" name="content" value="<?php echo esc_attr( $post_type->name ); ?>" /> <?php echo esc_html( $post_type->label ); ?></label></p>
<?php
}
add_action('export_filters','add_mav_menu_to_export');
/**
* Importer
*/
if ( ! defined( 'WP_LOAD_IMPORTERS' ) )
return;
// Load Importer API
require_once ABSPATH . 'wp-admin/includes/import.php';
if ( ! class_exists( 'WP_Importer' ) ) {
$class_wp_importer = ABSPATH . 'wp-admin/includes/class-wp-importer.php';
if ( file_exists( $class_wp_importer ) )
require $class_wp_importer;
}
// include WXR file parsers
$wordpress_importer = ABSPATH . 'wp-content/plugins/wordpress-importer/wordpress-importer.php';
if ( file_exists( $wordpress_importer ) )
require_once $wordpress_importer;
/**
* Nav Menu Importer class
*/
if ( class_exists( 'WP_Import' ) ) {
class Nav_Menu_Importer extends WP_Import {
function dispatch() {
$this->header();
$step = empty( $_GET['step'] ) ? 0 : (int) $_GET['step'];
switch ( $step ) {
case 0:
$this->greet();
break;
case 1:
check_admin_referer( 'import-upload' );
if ( $this->handle_upload() ) {
$file = get_attached_file( $this->id );
set_time_limit(0);
$this->import( $file );
}
break;
}
$this->footer();
}
function greet() {
wp_import_upload_form( add_query_arg('step', 1) );
}
function import_end() {
wp_import_cleanup( $this->id );
wp_cache_flush();
echo '<p>' . __( 'All done.', 'wordpress-importer' ) . ' <a href="' . admin_url() . '">' . __( 'Have fun!', 'wordpress-importer' ) . '</a>' . '</p>';
}
function import( $file ) {
$this->import_start( $file );
wp_suspend_cache_invalidation( true );
// only processing nav menus
$this->process_menus();
wp_suspend_cache_invalidation( false );
$this->import_end();
}
function process_menus() {
$count = 0;
foreach ( $this->posts as $item ) {
$count++;
// check the item is public nav item
if ( 'nav_menu_item' == $item['post_type'] && 'draft' != $item['status'] ) {
$menu_slug = false;
if ( isset($item['terms']) ) {
// loop through terms, assume first nav_menu term is correct menu
foreach ( $item['terms'] as $term ) {
if ( 'nav_menu' == $term['domain'] ) {
$menu_slug = $term['slug'];
break;
}
}
}
// no nav_menu term associated with this menu item
if ( ! $menu_slug ) {
_e( 'Menu item skipped due to missing menu slug', 'wordpress-importer' );
echo '<br>';
continue;
}
$menu_id = term_exists( $menu_slug, 'nav_menu' );
if ( ! $menu_id ) {
printf( __( 'Menu item skipped due to invalid menu slug: %s', 'wordpress-importer' ), esc_html( $menu_slug ) );
echo '<br>';
continue;
} else {
$menu_id = is_array( $menu_id ) ? $menu_id['term_id'] : $menu_id;
}
// set postmeta
foreach ( $item['postmeta'] as $meta )
$$meta['key'] = $meta['value'];
// skip nav item when menu item object is not exists
switch ($_menu_item_type) {
case 'taxonomy':
$_menu_item_object_id = get_term($_menu_item_object_id,$_menu_item_object);
if ($_menu_item_object_id == null || is_wp_error($_menu_item_object_id)) {
printf( __( 'Menu item skipped due to %s is not exists', 'nav-menu-exporter-importer' ), esc_html( $_menu_item_object ) );
echo '<br>';
}
break;
case 'post_type':
$_menu_item_object_id = get_post($_menu_item_object_id);
if ($_menu_item_object_id instanceof WP_Post) {
$_menu_item_object_id = $_menu_item_object_id->ID;
unset($_post);
} else {
printf( __( 'Menu item skipped due to %s is not exists', 'nav-menu-exporter-importer' ), esc_html( $_menu_item_object ) );
echo '<br>';
}
break;
}
if ($_menu_item_object_id == null || is_wp_error($_menu_item_object_id))
continue;
// wp_update_nav_menu_item expects CSS classes as a space separated string
$_menu_item_classes = maybe_unserialize( $_menu_item_classes );
if ( is_array( $_menu_item_classes ) )
$_menu_item_classes = implode( ' ', $_menu_item_classes );
$args = array(
'menu-item-object-id' => $_menu_item_object_id,
'menu-item-object' => $_menu_item_object,
'menu-item-parent-id' => $_menu_item_menu_item_parent,
'menu-item-position' => intval( $item['menu_order'] ),
'menu-item-type' => $_menu_item_type,
'menu-item-title' => $item['post_title'],
'menu-item-url' => $_menu_item_url,
'menu-item-description' => $item['post_content'],
'menu-item-attr-title' => $item['post_excerpt'],
'menu-item-target' => $_menu_item_target,
'menu-item-classes' => $_menu_item_classes,
'menu-item-xfn' => $_menu_item_xfn,
'menu-item-status' => $item['status']
);
$r = wp_update_nav_menu_item( $menu_id, 0, $args );
if ( $r && is_wp_error( $r ) ) {
echo $r->get_error_message();
echo '<br>';
} else {
echo '.';
}
}
}
echo '<br>';
printf( __( '%s items processed.', 'nav-menu-exporter-importer' ), esc_html( $count ) );
}
}
// setup importer
$nav_menu_importer = new Nav_Menu_Importer();
register_importer('nav_menu', __('Nav Menu', 'nav-menu-exporter-importer'), __('Export and Import nav menus. Requires WordPress Importer plugin', 'nav-menu-exporter-importer'), array ($nav_menu_importer, 'dispatch'));
} // class_exists( 'WP_Import' )
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