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<?php
/**
 * Core Navigation Menu API
 *
 * @package WordPress
 * @subpackage Nav_Menus
 * @since 3.0.0
 */

/** Walker_Nav_Menu_Edit class */
require_once( ABSPATH . 'wp-admin/includes/class-walker-nav-menu-edit.php' );

/** Walker_Nav_Menu_Checklist class */
require_once( ABSPATH . 'wp-admin/includes/class-walker-nav-menu-checklist.php' );

/**
 * Prints the appropriate response to a menu quick search.
 *
 * @since 3.0.0
 *
 * @param array $request The unsanitized request values.
 */
function _wp_ajax_menu_quick_search( $request = array() ) {
	$args = array();
	$type = isset( $request['type'] ) ? $request['type'] : '';
	$object_type = isset( $request['object_type'] ) ? $request['object_type'] : '';
	$query = isset( $request['q'] ) ? $request['q'] : '';
	$response_format = isset( $request['response-format'] ) && in_array( $request['response-format'], array( 'json', 'markup' ) ) ? $request['response-format'] : 'json';

if ( 'markup' == $response_format ) {
		$args['walker'] = new Walker_Nav_Menu_Checklist;
	}

if ( 'get-post-item' == $type ) {
		if ( post_type_exists( $object_type ) ) {
			if ( isset( $request['ID'] ) ) {
				$object_id = (int) $request['ID'];
				if ( 'markup' == $response_format ) {
					echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', array( get_post( $object_id ) ) ), 0, (object) $args );
				} elseif ( 'json' == $response_format ) {
					echo wp_json_encode(
						array(
							'ID' => $object_id,
							'post_title' => get_the_title( $object_id ),
							'post_type' => get_post_type( $object_id ),
						)
					);
					echo "\n";
				}
			}
		} elseif ( taxonomy_exists( $object_type ) ) {
			if ( isset( $request['ID'] ) ) {
				$object_id = (int) $request['ID'];
				if ( 'markup' == $response_format ) {
					echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', array( get_term( $object_id, $object_type ) ) ), 0, (object) $args );
				} elseif ( 'json' == $response_format ) {
					$post_obj = get_term( $object_id, $object_type );
					echo wp_json_encode(
						array(
							'ID' => $object_id,
							'post_title' => $post_obj->name,
							'post_type' => $object_type,
						)
					);
					echo "\n";
				}
			}

}

} elseif ( preg_match('/quick-search-(posttype|taxonomy)-([a-zA-Z_-]*\b)/', $type, $matches) ) {
		if ( 'posttype' == $matches[1] && get_post_type_object( $matches[2] ) ) {
			$post_type_obj = _wp_nav_menu_meta_box_object( get_post_type_object( $matches[2] ) );
			$args = array_merge(
				$args,
				array(
					'no_found_rows'          => true,
					'update_post_meta_cache' => false,
					'update_post_term_cache' => false,
					'posts_per_page'         => 10,
					'post_type'              => $matches[2],
					's'                      => $query,
				)
			);
			if ( isset( $post_type_obj->_default_query ) ) {
				$args = array_merge( $args, (array) $post_type_obj->_default_query );
			}
			$search_results_query = new WP_Query( $args );
			if ( ! $search_results_query->have_posts() ) {
				return;
			}
			while ( $search_results_query->have_posts() ) {
				$post = $search_results_query->next_post();
				if ( 'markup' == $response_format ) {
					$var_by_ref = $post->ID;
					echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', array( get_post( $var_by_ref ) ) ), 0, (object) $args );
				} elseif ( 'json' == $response_format ) {
					echo wp_json_encode(
						array(
							'ID' => $post->ID,
							'post_title' => get_the_title( $post->ID ),
							'post_type' => $matches[2],
						)
					);
					echo "\n";
				}
			}
		} elseif ( 'taxonomy' == $matches[1] ) {
			$terms = get_terms( $matches[2], array(
				'name__like' => $query,
				'number' => 10,
			));
			if ( empty( $terms ) || is_wp_error( $terms ) )
				return;
			foreach ( (array) $terms as $term ) {
				if ( 'markup' == $response_format ) {
					echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', array( $term ) ), 0, (object) $args );
				} elseif ( 'json' == $response_format ) {
					echo wp_json_encode(
						array(
							'ID' => $term->term_id,
							'post_title' => $term->name,
							'post_type' => $matches[2],
						)
					);
					echo "\n";
				}
			}
		}
	}
}

/**
 * Register nav menu meta boxes and advanced menu items.
 *
 * @since 3.0.0
 **/
function wp_nav_menu_setup() {
	// Register meta boxes
	wp_nav_menu_post_type_meta_boxes();
	add_meta_box( 'add-custom-links', __( 'Custom Links' ), 'wp_nav_menu_item_link_meta_box', 'nav-menus', 'side', 'default' );
	wp_nav_menu_taxonomy_meta_boxes();

// Register advanced menu items (columns)
	add_filter( 'manage_nav-menus_columns', 'wp_nav_menu_manage_columns' );

// If first time editing, disable advanced items by default.
	if ( false === get_user_option( 'managenav-menuscolumnshidden' ) ) {
		$user = wp_get_current_user();
		update_user_option($user->ID, 'managenav-menuscolumnshidden',
			array( 0 => 'link-target', 1 => 'css-classes', 2 => 'xfn', 3 => 'description', 4 => 'title-attribute', ),
			true);
	}
}

/**
 * Limit the amount of meta boxes to pages, posts, links, and categories for first time users.
 *
 * @since 3.0.0
 *
 * @global array $wp_meta_boxes
 **/
function wp_initial_nav_menu_meta_boxes() {
	global $wp_meta_boxes;

if ( get_user_option( 'metaboxhidden_nav-menus' ) !== false || ! is_array($wp_meta_boxes) )
		return;

$initial_meta_boxes = array( 'add-post-type-page', 'add-post-type-post', 'add-custom-links', 'add-category' );
	$hidden_meta_boxes = array();

foreach ( array_keys($wp_meta_boxes['nav-menus']) as $context ) {
		foreach ( array_keys($wp_meta_boxes['nav-menus'][$context]) as $priority ) {
			foreach ( $wp_meta_boxes['nav-menus'][$context][$priority] as $box ) {
				if ( in_array( $box['id'], $initial_meta_boxes ) ) {
					unset( $box['id'] );
				} else {
					$hidden_meta_boxes[] = $box['id'];
				}
			}
		}
	}

$user = wp_get_current_user();
	update_user_option( $user->ID, 'metaboxhidden_nav-menus', $hidden_meta_boxes, true );
}

/**
 * Creates meta boxes for any post type menu item..
 *
 * @since 3.0.0
 */
function wp_nav_menu_post_type_meta_boxes() {
	$post_types = get_post_types( array( 'show_in_nav_menus' => true ), 'object' );

if ( ! $post_types )
		return;

foreach ( $post_types as $post_type ) {
		/**
		 * Filters whether a menu items meta box will be added for the current
		 * object type.
		 *
		 * If a falsey value is returned instead of an object, the menu items
		 * meta box for the current meta box object will not be added.
		 *
		 * @since 3.0.0
		 *
		 * @param object $meta_box_object The current object to add a menu items
		 *                                meta box for.
		 */
		$post_type = apply_filters( 'nav_menu_meta_box_object', $post_type );
		if ( $post_type ) {
			$id = $post_type->name;
			// Give pages a higher priority.
			$priority = ( 'page' == $post_type->name ? 'core' : 'default' );
			add_meta_box( "add-post-type-{$id}", $post_type->labels->name, 'wp_nav_menu_item_post_type_meta_box', 'nav-menus', 'side', $priority, $post_type );
		}
	}
}

/**
 * Creates meta boxes for any taxonomy menu item.
 *
 * @since 3.0.0
 */
function wp_nav_menu_taxonomy_meta_boxes() {
	$taxonomies = get_taxonomies( array( 'show_in_nav_menus' => true ), 'object' );

if ( !$taxonomies )
		return;

foreach ( $taxonomies as $tax ) {
		/** This filter is documented in wp-admin/includes/nav-menu.php */
		$tax = apply_filters( 'nav_menu_meta_box_object', $tax );
		if ( $tax ) {
			$id = $tax->name;
			add_meta_box( "add-{$id}", $tax->labels->name, 'wp_nav_menu_item_taxonomy_meta_box', 'nav-menus', 'side', 'default', $tax );
		}
	}
}

/**
 * Check whether to disable the Menu Locations meta box submit button
 *
 * @since 3.6.0
 *
 * @global bool $one_theme_location_no_menus to determine if no menus exist
 *
 * @param int|string $nav_menu_selected_id (id, name or slug) of the currently-selected menu
 * @return string Disabled attribute if at least one menu exists, false if not
 */
function wp_nav_menu_disabled_check( $nav_menu_selected_id ) {
	global $one_theme_location_no_menus;

if ( $one_theme_location_no_menus )
		return false;

return disabled( $nav_menu_selected_id, 0 );
}

/**
 * Displays a meta box for the custom links menu item.
 *
 * @since 3.0.0
 *
 * @global int        $_nav_menu_placeholder
 * @global int|string $nav_menu_selected_id
 */
function wp_nav_menu_item_link_meta_box() {
	global $_nav_menu_placeholder, $nav_menu_selected_id;

$_nav_menu_placeholder = 0 > $_nav_menu_placeholder ? $_nav_menu_placeholder - 1 : -1;

?>
	<div class="customlinkdiv" id="customlinkdiv">
		<input type="hidden" value="custom" name="menu-item[<?php echo $_nav_menu_placeholder; ?>][menu-item-type]" />
		<p id="menu-item-url-wrap" class="wp-clearfix">
			<label class="howto" for="custom-menu-item-url"><?php _e( 'URL' ); ?></label>
			<input id="custom-menu-item-url" name="menu-item[<?php echo $_nav_menu_placeholder; ?>][menu-item-url]" type="text" class="code menu-item-textbox" value="http://" />
		</p>

<p id="menu-item-name-wrap" class="wp-clearfix">
			<label class="howto" for="custom-menu-item-name"><?php _e( 'Link Text' ); ?></label>
			<input id="custom-menu-item-name" name="menu-item[<?php echo $_nav_menu_placeholder; ?>][menu-item-title]" type="text" class="regular-text menu-item-textbox" />
		</p>

<p class="button-controls wp-clearfix">
			<span class="add-to-menu">
				<input type="submit"<?php wp_nav_menu_disabled_check( $nav_menu_selected_id ); ?> class="button submit-add-to-menu right" value="<?php esc_attr_e('Add to Menu'); ?>" name="add-custom-menu-item" id="submit-customlinkdiv" />
				<span class="spinner"></span>
			</span>
		</p>

</div>
	<?php
}

/**
 * Displays a meta box for a post type menu item.
 *
 * @since 3.0.0
 *
 * @global int        $_nav_menu_placeholder
 * @global int|string $nav_menu_selected_id
 *
 * @param string $object Not used.
 * @param array  $box {
 *     Post type menu item meta box arguments.
 *
 *     @type string       $id       Meta box 'id' attribute.
 *     @type string       $title    Meta box title.
 *     @type string       $callback Meta box display callback.
 *     @type WP_Post_Type $args     Extra meta box arguments (the post type object for this meta box).
 * }
 */
function wp_nav_menu_item_post_type_meta_box( $object, $box ) {
	global $_nav_menu_placeholder, $nav_menu_selected_id;

$post_type_name = $box['args']->name;

// Paginate browsing for large numbers of post objects.
	$per_page = 50;
	$pagenum = isset( $_REQUEST[$post_type_name . '-tab'] ) && isset( $_REQUEST['paged'] ) ? absint( $_REQUEST['paged'] ) : 1;
	$offset = 0 < $pagenum ? $per_page * ( $pagenum - 1 ) : 0;

$args = array(
		'offset' => $offset,
		'order' => 'ASC',
		'orderby' => 'title',
		'posts_per_page' => $per_page,
		'post_type' => $post_type_name,
		'suppress_filters' => true,
		'update_post_term_cache' => false,
		'update_post_meta_cache' => false
	);

if ( isset( $box['args']->_default_query ) )
		$args = array_merge($args, (array) $box['args']->_default_query );

// @todo transient caching of these results with proper invalidation on updating of a post of this type
	$get_posts = new WP_Query;
	$posts = $get_posts->query( $args );
	if ( ! $get_posts->post_count ) {
		echo '<p>' . __( 'No items.' ) . '</p>';
		return;
	}

$num_pages = $get_posts->max_num_pages;

$page_links = paginate_links( array(
		'base' => add_query_arg(
			array(
				$post_type_name . '-tab' => 'all',
				'paged' => '%#%',
				'item-type' => 'post_type',
				'item-object' => $post_type_name,
			)
		),
		'format' => '',
		'prev_text'          => '<span aria-label="' . esc_attr__( 'Previous page' ) . '">' . __( '«' ) . '</span>',
		'next_text'          => '<span aria-label="' . esc_attr__( 'Next page' ) . '">' . __( '»' ) . '</span>',
		'before_page_number' => '<span class="screen-reader-text">' . __( 'Page' ) . '</span> ',
		'total'   => $num_pages,
		'current' => $pagenum
	));

$db_fields = false;
	if ( is_post_type_hierarchical( $post_type_name ) ) {
		$db_fields = array( 'parent' => 'post_parent', 'id' => 'ID' );
	}

$walker = new Walker_Nav_Menu_Checklist( $db_fields );

$current_tab = 'most-recent';
	if ( isset( $_REQUEST[$post_type_name . '-tab'] ) && in_array( $_REQUEST[$post_type_name . '-tab'], array('all', 'search') ) ) {
		$current_tab = $_REQUEST[$post_type_name . '-tab'];
	}

if ( ! empty( $_REQUEST['quick-search-posttype-' . $post_type_name] ) ) {
		$current_tab = 'search';
	}

$removed_args = array(
		'action',
		'customlink-tab',
		'edit-menu-item',
		'menu-item',
		'page-tab',
		'_wpnonce',
	);

?>
	<div id="posttype-<?php echo $post_type_name; ?>" class="posttypediv">
		<ul id="posttype-<?php echo $post_type_name; ?>-tabs" class="posttype-tabs add-menu-item-tabs">
			<li <?php echo ( 'most-recent' == $current_tab ? ' class="tabs"' : '' ); ?>>
				<a class="nav-tab-link" data-type="tabs-panel-posttype-<?php echo esc_attr( $post_type_name ); ?>-most-recent" href="<?php if ( $nav_menu_selected_id ) echo esc_url(add_query_arg($post_type_name . '-tab', 'most-recent', remove_query_arg($removed_args))); ?>#tabs-panel-posttype-<?php echo $post_type_name; ?>-most-recent">
					<?php _e( 'Most Recent' ); ?>
				</a>
			</li>
			<li <?php echo ( 'all' == $current_tab ? ' class="tabs"' : '' ); ?>>
				<a class="nav-tab-link" data-type="<?php echo esc_attr( $post_type_name ); ?>-all" href="<?php if ( $nav_menu_selected_id ) echo esc_url(add_query_arg($post_type_name . '-tab', 'all', remove_query_arg($removed_args))); ?>#<?php echo $post_type_name; ?>-all">
					<?php _e( 'View All' ); ?>
				</a>
			</li>
			<li <?php echo ( 'search' == $current_tab ? ' class="tabs"' : '' ); ?>>
				<a class="nav-tab-link" data-type="tabs-panel-posttype-<?php echo esc_attr( $post_type_name ); ?>-search" href="<?php if ( $nav_menu_selected_id ) echo esc_url(add_query_arg($post_type_name . '-tab', 'search', remove_query_arg($removed_args))); ?>#tabs-panel-posttype-<?php echo $post_type_name; ?>-search">
					<?php _e( 'Search'); ?>
				</a>
			</li>
		</ul>

<div id="tabs-panel-posttype-<?php echo $post_type_name; ?>-most-recent" class="tabs-panel <?php
			echo ( 'most-recent' == $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' );
		?>">
			<ul id="<?php echo $post_type_name; ?>checklist-most-recent" class="categorychecklist form-no-clear">
				<?php
				$recent_args = array_merge( $args, array( 'orderby' => 'post_date', 'order' => 'DESC', 'posts_per_page' => 15 ) );
				$most_recent = $get_posts->query( $recent_args );
				$args['walker'] = $walker;

/**
				 * Filters the posts displayed in the 'Most Recent' tab of the current
				 * post type's menu items meta box.
				 *
				 * The dynamic portion of the hook name, `$post_type_name`, refers to the post type name.
				 *
				 * @since 4.3.0
				 *
				 * @param array $most_recent An array of post objects being listed.
				 * @param array $args        An array of WP_Query arguments.
				 * @param array $box         Arguments passed to wp_nav_menu_item_post_type_meta_box().
				 */
				$most_recent = apply_filters( "nav_menu_items_{$post_type_name}_recent", $most_recent, $args, $box );

echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $most_recent), 0, (object) $args );
				?>
			</ul>
		</div>

<div class="tabs-panel <?php
			echo ( 'search' == $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' );
		?>" id="tabs-panel-posttype-<?php echo $post_type_name; ?>-search">
			<?php
			if ( isset( $_REQUEST['quick-search-posttype-' . $post_type_name] ) ) {
				$searched = esc_attr( $_REQUEST['quick-search-posttype-' . $post_type_name] );
				$search_results = get_posts( array( 's' => $searched, 'post_type' => $post_type_name, 'fields' => 'all', 'order' => 'DESC', ) );
			} else {
				$searched = '';
				$search_results = array();
			}
			?>
			<p class="quick-search-wrap">
				<label for="quick-search-posttype-<?php echo $post_type_name; ?>" class="screen-reader-text"><?php _e( 'Search' ); ?></label>
				<input type="search" class="quick-search" value="<?php echo $searched; ?>" name="quick-search-posttype-<?php echo $post_type_name; ?>" id="quick-search-posttype-<?php echo $post_type_name; ?>" />
				<span class="spinner"></span>
				<?php submit_button( __( 'Search' ), 'small quick-search-submit hide-if-js', 'submit', false, array( 'id' => 'submit-quick-search-posttype-' . $post_type_name ) ); ?>
			</p>

<ul id="<?php echo $post_type_name; ?>-search-checklist" data-wp-lists="list:<?php echo $post_type_name?>" class="categorychecklist form-no-clear">
			<?php if ( ! empty( $search_results ) && ! is_wp_error( $search_results ) ) : ?>
				<?php
				$args['walker'] = $walker;
				echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $search_results), 0, (object) $args );
				?>
			<?php elseif ( is_wp_error( $search_results ) ) : ?>
				<li><?php echo $search_results->get_error_message(); ?></li>
			<?php elseif ( ! empty( $searched ) ) : ?>
				<li><?php _e('No results found.'); ?></li>
			<?php endif; ?>
			</ul>
		</div>

<div id="<?php echo $post_type_name; ?>-all" class="tabs-panel tabs-panel-view-all <?php
			echo ( 'all' == $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' );
		?>">
			<?php if ( ! empty( $page_links ) ) : ?>
				<div class="add-menu-item-pagelinks">
					<?php echo $page_links; ?>
				</div>
			<?php endif; ?>
			<ul id="<?php echo $post_type_name; ?>checklist" data-wp-lists="list:<?php echo $post_type_name?>" class="categorychecklist form-no-clear">
				<?php
				$args['walker'] = $walker;

/*
				 * If we're dealing with pages, let's put a checkbox for the front
				 * page at the top of the list.
				 */
				if ( 'page' == $post_type_name ) {
					$front_page = 'page' == get_option('show_on_front') ? (int) get_option( 'page_on_front' ) : 0;
					if ( ! empty( $front_page ) ) {
						$front_page_obj = get_post( $front_page );
						$front_page_obj->front_or_home = true;
						array_unshift( $posts, $front_page_obj );
					} else {
						$_nav_menu_placeholder = ( 0 > $_nav_menu_placeholder ) ? intval($_nav_menu_placeholder) - 1 : -1;
						array_unshift( $posts, (object) array(
							'front_or_home' => true,
							'ID' => 0,
							'object_id' => $_nav_menu_placeholder,
							'post_content' => '',
							'post_excerpt' => '',
							'post_parent' => '',
							'post_title' => _x('Home', 'nav menu home label'),
							'post_type' => 'nav_menu_item',
							'type' => 'custom',
							'url' => home_url('/'),
						) );
					}
				}

$post_type = get_post_type_object( $post_type_name );

if ( $post_type->has_archive ) {
					$_nav_menu_placeholder = ( 0 > $_nav_menu_placeholder ) ? intval($_nav_menu_placeholder) - 1 : -1;
					array_unshift( $posts, (object) array(
						'ID' => 0,
						'object_id' => $_nav_menu_placeholder,
						'object'     => $post_type_name,
						'post_content' => '',
						'post_excerpt' => '',
						'post_title' => $post_type->labels->archives,
						'post_type' => 'nav_menu_item',
						'type' => 'post_type_archive',
						'url' => get_post_type_archive_link( $post_type_name ),
					) );
				}

/**
				 * Filters the posts displayed in the 'View All' tab of the current
				 * post type's menu items meta box.
				 *
				 * The dynamic portion of the hook name, `$post_type_name`, refers
				 * to the slug of the current post type.
				 *
				 * @since 3.2.0
				 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
				 *
				 * @see WP_Query::query()
				 *
				 * @param array        $posts     The posts for the current post type.
				 * @param array        $args      An array of WP_Query arguments.
				 * @param WP_Post_Type $post_type The current post type object for this menu item meta box.
				 */
				$posts = apply_filters( "nav_menu_items_{$post_type_name}", $posts, $args, $post_type );

$checkbox_items = walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $posts), 0, (object) $args );

if ( 'all' == $current_tab && ! empty( $_REQUEST['selectall'] ) ) {
					$checkbox_items = preg_replace('/(type=(.)checkbox(\2))/', '$1 checked=$2checked$2', $checkbox_items);

}

echo $checkbox_items;
				?>
			</ul>
			<?php if ( ! empty( $page_links ) ) : ?>
				<div class="add-menu-item-pagelinks">
					<?php echo $page_links; ?>
				</div>
			<?php endif; ?>
		</div>

<p class="button-controls wp-clearfix">
			<span class="list-controls">
				<a href="<?php
					echo esc_url( add_query_arg(
						array(
							$post_type_name . '-tab' => 'all',
							'selectall' => 1,
						),
						remove_query_arg( $removed_args )
					));
				?>#posttype-<?php echo $post_type_name; ?>" class="select-all aria-button-if-js"><?php _e( 'Select All' ); ?></a>
			</span>

<span class="add-to-menu">
				<input type="submit"<?php wp_nav_menu_disabled_check( $nav_menu_selected_id ); ?> class="button submit-add-to-menu right" value="<?php esc_attr_e( 'Add to Menu' ); ?>" name="add-post-type-menu-item" id="<?php echo esc_attr( 'submit-posttype-' . $post_type_name ); ?>" />
				<span class="spinner"></span>
			</span>
		</p>

</div>
	<?php
}

/**
 * Displays a meta box for a taxonomy menu item.
 *
 * @since 3.0.0
 *
 * @global int|string $nav_menu_selected_id
 *
 * @param string $object Not used.
 * @param array  $box {
 *     Taxonomy menu item meta box arguments.
 *
 *     @type string $id       Meta box 'id' attribute.
 *     @type string $title    Meta box title.
 *     @type string $callback Meta box display callback.
 *     @type object $args     Extra meta box arguments (the taxonomy object for this meta box).
 * }
 */
function wp_nav_menu_item_taxonomy_meta_box( $object, $box ) {
	global $nav_menu_selected_id;
	$taxonomy_name = $box['args']->name;

// Paginate browsing for large numbers of objects.
	$per_page = 50;
	$pagenum = isset( $_REQUEST[$taxonomy_name . '-tab'] ) && isset( $_REQUEST['paged'] ) ? absint( $_REQUEST['paged'] ) : 1;
	$offset = 0 < $pagenum ? $per_page * ( $pagenum - 1 ) : 0;

$args = array(
		'child_of' => 0,
		'exclude' => '',
		'hide_empty' => false,
		'hierarchical' => 1,
		'include' => '',
		'number' => $per_page,
		'offset' => $offset,
		'order' => 'ASC',
		'orderby' => 'name',
		'pad_counts' => false,
	);

$terms = get_terms( $taxonomy_name, $args );

if ( ! $terms || is_wp_error($terms) ) {
		echo '<p>' . __( 'No items.' ) . '</p>';
		return;
	}

$num_pages = ceil( wp_count_terms( $taxonomy_name , array_merge( $args, array('number' => '', 'offset' => '') ) ) / $per_page );

$page_links = paginate_links( array(
		'base' => add_query_arg(
			array(
				$taxonomy_name . '-tab' => 'all',
				'paged' => '%#%',
				'item-type' => 'taxonomy',
				'item-object' => $taxonomy_name,
			)
		),
		'format' => '',
		'prev_text'          => '<span aria-label="' . esc_attr__( 'Previous page' ) . '">' . __( '«' ) . '</span>',
		'next_text'          => '<span aria-label="' . esc_attr__( 'Next page' ) . '">' . __( '»' ) . '</span>',
		'before_page_number' => '<span class="screen-reader-text">' . __( 'Page' ) . '</span> ',
		'total'   => $num_pages,
		'current' => $pagenum
	));

$db_fields = false;
	if ( is_taxonomy_hierarchical( $taxonomy_name ) ) {
		$db_fields = array( 'parent' => 'parent', 'id' => 'term_id' );
	}

$walker = new Walker_Nav_Menu_Checklist( $db_fields );

$current_tab = 'most-used';
	if ( isset( $_REQUEST[$taxonomy_name . '-tab'] ) && in_array( $_REQUEST[$taxonomy_name . '-tab'], array('all', 'most-used', 'search') ) ) {
		$current_tab = $_REQUEST[$taxonomy_name . '-tab'];
	}

if ( ! empty( $_REQUEST['quick-search-taxonomy-' . $taxonomy_name] ) ) {
		$current_tab = 'search';
	}

$removed_args = array(
		'action',
		'customlink-tab',
		'edit-menu-item',
		'menu-item',
		'page-tab',
		'_wpnonce',
	);

?>
	<div id="taxonomy-<?php echo $taxonomy_name; ?>" class="taxonomydiv">
		<ul id="taxonomy-<?php echo $taxonomy_name; ?>-tabs" class="taxonomy-tabs add-menu-item-tabs">
			<li <?php echo ( 'most-used' == $current_tab ? ' class="tabs"' : '' ); ?>>
				<a class="nav-tab-link" data-type="tabs-panel-<?php echo esc_attr( $taxonomy_name ); ?>-pop" href="<?php if ( $nav_menu_selected_id ) echo esc_url(add_query_arg($taxonomy_name . '-tab', 'most-used', remove_query_arg($removed_args))); ?>#tabs-panel-<?php echo $taxonomy_name; ?>-pop">
					<?php _e( 'Most Used' ); ?>
				</a>
			</li>
			<li <?php echo ( 'all' == $current_tab ? ' class="tabs"' : '' ); ?>>
				<a class="nav-tab-link" data-type="tabs-panel-<?php echo esc_attr( $taxonomy_name ); ?>-all" href="<?php if ( $nav_menu_selected_id ) echo esc_url(add_query_arg($taxonomy_name . '-tab', 'all', remove_query_arg($removed_args))); ?>#tabs-panel-<?php echo $taxonomy_name; ?>-all">
					<?php _e( 'View All' ); ?>
				</a>
			</li>
			<li <?php echo ( 'search' == $current_tab ? ' class="tabs"' : '' ); ?>>
				<a class="nav-tab-link" data-type="tabs-panel-search-taxonomy-<?php echo esc_attr( $taxonomy_name ); ?>" href="<?php if ( $nav_menu_selected_id ) echo esc_url(add_query_arg($taxonomy_name . '-tab', 'search', remove_query_arg($removed_args))); ?>#tabs-panel-search-taxonomy-<?php echo $taxonomy_name; ?>">
					<?php _e( 'Search' ); ?>
				</a>
			</li>
		</ul>

<div id="tabs-panel-<?php echo $taxonomy_name; ?>-pop" class="tabs-panel <?php
			echo ( 'most-used' == $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' );
		?>">
			<ul id="<?php echo $taxonomy_name; ?>checklist-pop" class="categorychecklist form-no-clear" >
				<?php
				$popular_terms = get_terms( $taxonomy_name, array( 'orderby' => 'count', 'order' => 'DESC', 'number' => 10, 'hierarchical' => false ) );
				$args['walker'] = $walker;
				echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $popular_terms), 0, (object) $args );
				?>
			</ul>
		</div>

<div id="tabs-panel-<?php echo $taxonomy_name; ?>-all" class="tabs-panel tabs-panel-view-all <?php
			echo ( 'all' == $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' );
		?>">
			<?php if ( ! empty( $page_links ) ) : ?>
				<div class="add-menu-item-pagelinks">
					<?php echo $page_links; ?>
				</div>
			<?php endif; ?>
			<ul id="<?php echo $taxonomy_name; ?>checklist" data-wp-lists="list:<?php echo $taxonomy_name?>" class="categorychecklist form-no-clear">
				<?php
				$args['walker'] = $walker;
				echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $terms), 0, (object) $args );
				?>
			</ul>
			<?php if ( ! empty( $page_links ) ) : ?>
				<div class="add-menu-item-pagelinks">
					<?php echo $page_links; ?>
				</div>
			<?php endif; ?>
		</div>

<div class="tabs-panel <?php
			echo ( 'search' == $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' );
		?>" id="tabs-panel-search-taxonomy-<?php echo $taxonomy_name; ?>">
			<?php
			if ( isset( $_REQUEST['quick-search-taxonomy-' . $taxonomy_name] ) ) {
				$searched = esc_attr( $_REQUEST['quick-search-taxonomy-' . $taxonomy_name] );
				$search_results = get_terms( $taxonomy_name, array( 'name__like' => $searched, 'fields' => 'all', 'orderby' => 'count', 'order' => 'DESC', 'hierarchical' => false ) );
			} else {
				$searched = '';
				$search_results = array();
			}
			?>
			<p class="quick-search-wrap">
				<label for="quick-search-taxonomy-<?php echo $taxonomy_name; ?>" class="screen-reader-text"><?php _e( 'Search' ); ?></label>
				<input type="search" class="quick-search" value="<?php echo $searched; ?>" name="quick-search-taxonomy-<?php echo $taxonomy_name; ?>" id="quick-search-taxonomy-<?php echo $taxonomy_name; ?>" />
				<span class="spinner"></span>
				<?php submit_button( __( 'Search' ), 'small quick-search-submit hide-if-js', 'submit', false, array( 'id' => 'submit-quick-search-taxonomy-' . $taxonomy_name ) ); ?>
			</p>

<ul id="<?php echo $taxonomy_name; ?>-search-checklist" data-wp-lists="list:<?php echo $taxonomy_name?>" class="categorychecklist form-no-clear">
			<?php if ( ! empty( $search_results ) && ! is_wp_error( $search_results ) ) : ?>
				<?php
				$args['walker'] = $walker;
				echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $search_results), 0, (object) $args );
				?>
			<?php elseif ( is_wp_error( $search_results ) ) : ?>
				<li><?php echo $search_results->get_error_message(); ?></li>
			<?php elseif ( ! empty( $searched ) ) : ?>
				<li><?php _e('No results found.'); ?></li>
			<?php endif; ?>
			</ul>
		</div>

<p class="button-controls wp-clearfix">
			<span class="list-controls">
				<a href="<?php
					echo esc_url(add_query_arg(
						array(
							$taxonomy_name . '-tab' => 'all',
							'selectall' => 1,
						),
						remove_query_arg($removed_args)
					));
				?>#taxonomy-<?php echo $taxonomy_name; ?>" class="select-all aria-button-if-js"><?php _e( 'Select All' ); ?></a>
			</span>

<span class="add-to-menu">
				<input type="submit"<?php wp_nav_menu_disabled_check( $nav_menu_selected_id ); ?> class="button submit-add-to-menu right" value="<?php esc_attr_e( 'Add to Menu' ); ?>" name="add-taxonomy-menu-item" id="<?php echo esc_attr( 'submit-taxonomy-' . $taxonomy_name ); ?>" />
				<span class="spinner"></span>
			</span>
		</p>

</div>
	<?php
}

/**
 * Save posted nav menu item data.
 *
 * @since 3.0.0
 *
 * @param int $menu_id The menu ID for which to save this item. $menu_id of 0 makes a draft, orphaned menu item.
 * @param array $menu_data The unsanitized posted menu item data.
 * @return array The database IDs of the items saved
 */
function wp_save_nav_menu_items( $menu_id = 0, $menu_data = array() ) {
	$menu_id = (int) $menu_id;
	$items_saved = array();

if ( 0 == $menu_id || is_nav_menu( $menu_id ) ) {

// Loop through all the menu items' POST values.
		foreach ( (array) $menu_data as $_possible_db_id => $_item_object_data ) {
			if (
				// Checkbox is not checked.
				empty( $_item_object_data['menu-item-object-id'] ) &&
				(
					// And item type either isn't set.
					! isset( $_item_object_data['menu-item-type'] ) ||
					// Or URL is the default.
					in_array( $_item_object_data['menu-item-url'], array( 'http://', '' ) ) ||
					! ( 'custom' == $_item_object_data['menu-item-type'] && ! isset( $_item_object_data['menu-item-db-id'] ) ) || // or it's not a custom menu item (but not the custom home page)
					// Or it *is* a custom menu item that already exists.
					! empty( $_item_object_data['menu-item-db-id'] )
				)
			) {
				// Then this potential menu item is not getting added to this menu.
				continue;
			}

// If this possible menu item doesn't actually have a menu database ID yet.
			if (
				empty( $_item_object_data['menu-item-db-id'] ) ||
				( 0 > $_possible_db_id ) ||
				$_possible_db_id != $_item_object_data['menu-item-db-id']
			) {
				$_actual_db_id = 0;
			} else {
				$_actual_db_id = (int) $_item_object_data['menu-item-db-id'];
			}

$args = array(
				'menu-item-db-id' => ( isset( $_item_object_data['menu-item-db-id'] ) ? $_item_object_data['menu-item-db-id'] : '' ),
				'menu-item-object-id' => ( isset( $_item_object_data['menu-item-object-id'] ) ? $_item_object_data['menu-item-object-id'] : '' ),
				'menu-item-object' => ( isset( $_item_object_data['menu-item-object'] ) ? $_item_object_data['menu-item-object'] : '' ),
				'menu-item-parent-id' => ( isset( $_item_object_data['menu-item-parent-id'] ) ? $_item_object_data['menu-item-parent-id'] : '' ),
				'menu-item-position' => ( isset( $_item_object_data['menu-item-position'] ) ? $_item_object_data['menu-item-position'] : '' ),
				'menu-item-type' => ( isset( $_item_object_data['menu-item-type'] ) ? $_item_object_data['menu-item-type'] : '' ),
				'menu-item-title' => ( isset( $_item_object_data['menu-item-title'] ) ? $_item_object_data['menu-item-title'] : '' ),
				'menu-item-url' => ( isset( $_item_object_data['menu-item-url'] ) ? $_item_object_data['menu-item-url'] : '' ),
				'menu-item-description' => ( isset( $_item_object_data['menu-item-description'] ) ? $_item_object_data['menu-item-description'] : '' ),
				'menu-item-attr-title' => ( isset( $_item_object_data['menu-item-attr-title'] ) ? $_item_object_data['menu-item-attr-title'] : '' ),
				'menu-item-target' => ( isset( $_item_object_data['menu-item-target'] ) ? $_item_object_data['menu-item-target'] : '' ),
				'menu-item-classes' => ( isset( $_item_object_data['menu-item-classes'] ) ? $_item_object_data['menu-item-classes'] : '' ),
				'menu-item-xfn' => ( isset( $_item_object_data['menu-item-xfn'] ) ? $_item_object_data['menu-item-xfn'] : '' ),
			);

$items_saved[] = wp_update_nav_menu_item( $menu_id, $_actual_db_id, $args );

}
	}
	return $items_saved;
}

/**
 * Adds custom arguments to some of the meta box object types.
 *
 * @since 3.0.0
 *
 * @access private
 *
 * @param object $object The post type or taxonomy meta-object.
 * @return object The post type of taxonomy object.
 */
function _wp_nav_menu_meta_box_object( $object = null ) {
	if ( isset( $object->name ) ) {

if ( 'page' == $object->name ) {
			$object->_default_query = array(
				'orderby' => 'menu_order title',
				'post_status' => 'publish',
			);

// Posts should show only published items.
		} elseif ( 'post' == $object->name ) {
			$object->_default_query = array(
				'post_status' => 'publish',
			);

// Categories should be in reverse chronological order.
		} elseif ( 'category' == $object->name ) {
			$object->_default_query = array(
				'orderby' => 'id',
				'order' => 'DESC',
			);

// Custom post types should show only published items.
		} else {
			$object->_default_query = array(
				'post_status' => 'publish',
			);
		}
	}

return $object;
}

/**
 * Returns the menu formatted to edit.
 *
 * @since 3.0.0
 *
 * @param int $menu_id Optional. The ID of the menu to format. Default 0.
 * @return string|WP_Error $output The menu formatted to edit or error object on failure.
 */
function wp_get_nav_menu_to_edit( $menu_id = 0 ) {
	$menu = wp_get_nav_menu_object( $menu_id );

// If the menu exists, get its items.
	if ( is_nav_menu( $menu ) ) {
		$menu_items = wp_get_nav_menu_items( $menu->term_id, array('post_status' => 'any') );
		$result = '<div id="menu-instructions" class="post-body-plain';
		$result .= ( ! empty($menu_items) ) ? ' menu-instructions-inactive">' : '">';
		$result .= '<p>' . __( 'Add menu items from the column on the left.' ) . '</p>';
		$result .= '</div>';

if ( empty($menu_items) )
			return $result . ' <ul class="menu" id="menu-to-edit"> </ul>';

/**
		 * Filters the Walker class used when adding nav menu items.
		 *
		 * @since 3.0.0
		 *
		 * @param string $class   The walker class to use. Default 'Walker_Nav_Menu_Edit'.
		 * @param int    $menu_id ID of the menu being rendered.
		 */
		$walker_class_name = apply_filters( 'wp_edit_nav_menu_walker', 'Walker_Nav_Menu_Edit', $menu_id );

if ( class_exists( $walker_class_name ) ) {
			$walker = new $walker_class_name;
		} else {
			return new WP_Error( 'menu_walker_not_exist',
				/* translators: %s: walker class name */
				sprintf( __( 'The Walker class named %s does not exist.' ),
					'<strong>' . $walker_class_name . '</strong>'
				)
			);
		}

$some_pending_menu_items = $some_invalid_menu_items = false;
		foreach ( (array) $menu_items as $menu_item ) {
			if ( isset( $menu_item->post_status ) && 'draft' == $menu_item->post_status )
				$some_pending_menu_items = true;
			if ( ! empty( $menu_item->_invalid ) )
				$some_invalid_menu_items = true;
		}

if ( $some_pending_menu_items ) {
			$result .= '<div class="notice notice-info notice-alt inline"><p>' . __( 'Click Save Menu to make pending menu items public.' ) . '</p></div>';
		}

if ( $some_invalid_menu_items ) {
			$result .= '<div class="notice notice-error notice-alt inline"><p>' . __( 'There are some invalid menu items. Please check or delete them.' ) . '</p></div>';
		}

$result .= '<ul class="menu" id="menu-to-edit"> ';
		$result .= walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $menu_items), 0, (object) array('walker' => $walker ) );
		$result .= ' </ul> ';
		return $result;
	} elseif ( is_wp_error( $menu ) ) {
		return $menu;
	}

}

/**
 * Returns the columns for the nav menus page.
 *
 * @since 3.0.0
 *
 * @return array Columns.
 */
function wp_nav_menu_manage_columns() {
	return array(
		'_title'          => __( 'Show advanced menu properties' ),
		'cb'              => '<input type="checkbox" />',
		'link-target'     => __( 'Link Target' ),
		'title-attribute' => __( 'Title Attribute' ),
		'css-classes'     => __( 'CSS Classes' ),
		'xfn'             => __( 'Link Relationship (XFN)' ),
		'description'     => __( 'Description' ),
	);
}

/**
 * Deletes orphaned draft menu items
 *
 * @access private
 * @since 3.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 */
function _wp_delete_orphaned_draft_menu_items() {
	global $wpdb;
	$delete_timestamp = time() - ( DAY_IN_SECONDS * EMPTY_TRASH_DAYS );

// Delete orphaned draft menu items.
	$menu_items_to_delete = $wpdb->get_col($wpdb->prepare("SELECT ID FROM $wpdb->posts AS p LEFT JOIN $wpdb->postmeta AS m ON p.ID = m.post_id WHERE post_type = 'nav_menu_item' AND post_status = 'draft' AND meta_key = '_menu_item_orphaned' AND meta_value < '%d'", $delete_timestamp ) );

foreach ( (array) $menu_items_to_delete as $menu_item_id )
		wp_delete_post( $menu_item_id, true );
}

/**
 * Saves nav menu items
 *
 * @since 3.6.0
 *
 * @param int|string $nav_menu_selected_id (id, slug, or name ) of the currently-selected menu
 * @param string $nav_menu_selected_title Title of the currently-selected menu
 * @return array $messages The menu updated message
 */
function wp_nav_menu_update_menu_items ( $nav_menu_selected_id, $nav_menu_selected_title ) {
	$unsorted_menu_items = wp_get_nav_menu_items( $nav_menu_selected_id, array( 'orderby' => 'ID', 'output' => ARRAY_A, 'output_key' => 'ID', 'post_status' => 'draft,publish' ) );
	$messages = array();
	$menu_items = array();
	// Index menu items by db ID
	foreach ( $unsorted_menu_items as $_item )
		$menu_items[$_item->db_id] = $_item;

$post_fields = array(
		'menu-item-db-id', 'menu-item-object-id', 'menu-item-object',
		'menu-item-parent-id', 'menu-item-position', 'menu-item-type',
		'menu-item-title', 'menu-item-url', 'menu-item-description',
		'menu-item-attr-title', 'menu-item-target', 'menu-item-classes', 'menu-item-xfn'
	);

wp_defer_term_counting( true );
	// Loop through all the menu items' POST variables
	if ( ! empty( $_POST['menu-item-db-id'] ) ) {
		foreach ( (array) $_POST['menu-item-db-id'] as $_key => $k ) {

// Menu item title can't be blank
			if ( ! isset( $_POST['menu-item-title'][ $_key ] ) || '' == $_POST['menu-item-title'][ $_key ] )
				continue;

$args = array();
			foreach ( $post_fields as $field )
				$args[$field] = isset( $_POST[$field][$_key] ) ? $_POST[$field][$_key] : '';

$menu_item_db_id = wp_update_nav_menu_item( $nav_menu_selected_id, ( $_POST['menu-item-db-id'][$_key] != $_key ? 0 : $_key ), $args );

if ( is_wp_error( $menu_item_db_id ) ) {
				$messages[] = '<div id="message" class="error"><p>' . $menu_item_db_id->get_error_message() . '</p></div>';
			} else {
				unset( $menu_items[ $menu_item_db_id ] );
			}
		}
	}

// Remove menu items from the menu that weren't in $_POST
	if ( ! empty( $menu_items ) ) {
		foreach ( array_keys( $menu_items ) as $menu_item_id ) {
			if ( is_nav_menu_item( $menu_item_id ) ) {
				wp_delete_post( $menu_item_id );
			}
		}
	}

// Store 'auto-add' pages.
	$auto_add = ! empty( $_POST['auto-add-pages'] );
	$nav_menu_option = (array) get_option( 'nav_menu_options' );
	if ( ! isset( $nav_menu_option['auto_add'] ) )
		$nav_menu_option['auto_add'] = array();
	if ( $auto_add ) {
		if ( ! in_array( $nav_menu_selected_id, $nav_menu_option['auto_add'] ) )
			$nav_menu_option['auto_add'][] = $nav_menu_selected_id;
	} else {
		if ( false !== ( $key = array_search( $nav_menu_selected_id, $nav_menu_option['auto_add'] ) ) )
			unset( $nav_menu_option['auto_add'][$key] );
	}
	// Remove nonexistent/deleted menus
	$nav_menu_option['auto_add'] = array_intersect( $nav_menu_option['auto_add'], wp_get_nav_menus( array( 'fields' => 'ids' ) ) );
	update_option( 'nav_menu_options', $nav_menu_option );

wp_defer_term_counting( false );

/** This action is documented in wp-includes/nav-menu.php */
	do_action( 'wp_update_nav_menu', $nav_menu_selected_id );

$messages[] = '<div id="message" class="updated notice is-dismissible"><p>' .
		/* translators: %s: nav menu title */
		sprintf( __( '%s has been updated.' ),
			'<strong>' . $nav_menu_selected_title . '</strong>'
		) . '</p></div>';

unset( $menu_items, $unsorted_menu_items );

return $messages;
}

/**
 * If a JSON blob of navigation menu data is in POST data, expand it and inject
 * it into `$_POST` to avoid PHP `max_input_vars` limitations. See #14134.
 *
 * @ignore
 * @since 4.5.3
 * @access private
 */
function _wp_expand_nav_menu_post_data() {
	if ( ! isset( $_POST['nav-menu-data'] ) ) {
		return;
	}

$data = json_decode( stripslashes( $_POST['nav-menu-data'] ) );

if ( ! is_null( $data ) && $data ) {
		foreach ( $data as $post_input_data ) {
			// For input names that are arrays (e.g. `menu-item-db-id[3][4][5]`),
			// derive the array path keys via regex and set the value in $_POST.
			preg_match( '#([^\[]*)(\[(.+)\])?#', $post_input_data->name, $matches );

$array_bits = array( $matches[1] );

if ( isset( $matches[3] ) ) {
				$array_bits = array_merge( $array_bits, explode( '][', $matches[3] ) );
			}

$new_post_data = array();

// Build the new array value from leaf to trunk.
			for ( $i = count( $array_bits ) - 1; $i >= 0; $i -- ) {
				if ( $i == count( $array_bits ) - 1 ) {
					$new_post_data[ $array_bits[ $i ] ] = wp_slash( $post_input_data->value );
				} else {
					$new_post_data = array( $array_bits[ $i ] => $new_post_data );
				}
			}

$_POST = array_replace_recursive( $_POST, $new_post_data );
		}
	}
}