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Edit File: class-walker-nav-menu.php
<?php /** * Nav Menu API: Walker_Nav_Menu class * * @package WordPress * @subpackage Nav_Menus * @since 4.6.0 */ /** * Core class used to implement an HTML list of nav menu items. * * @since 3.0.0 * * @see Walker */ class Walker_Nav_Menu extends Walker { /** * What the class handles. * * @since 3.0.0 * @var string * * @see Walker::$tree_type */ public $tree_type = array( 'post_type', 'taxonomy', 'custom' ); /** * Database fields to use. * * @since 3.0.0 * @todo Decouple this. * @var string[] * * @see Walker::$db_fields */ public $db_fields = array( 'parent' => 'menu_item_parent', 'id' => 'db_id', ); /** * The URL to the privacy policy page. * * @since 6.8.0 * @var string */ private $privacy_policy_url; /** * Constructor. * * @since 6.8.0 */ public function __construct() { $this->privacy_policy_url = get_privacy_policy_url(); } /** * Starts the list before the elements are added. * * @since 3.0.0 * * @see Walker::start_lvl() * * @param string $output Used to append additional content (passed by reference). * @param int $depth Depth of menu item. Used for padding. * @param stdClass $args An object of wp_nav_menu() arguments. */ public function start_lvl( &$output, $depth = 0, $args = null ) { if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) { $t = ''; $n = ''; } else { $t = "\t"; $n = "\n"; } $indent = str_repeat( $t, $depth ); // Default class. $classes = array( 'sub-menu' ); /** * Filters the CSS class(es) applied to a menu list element. * * @since 4.8.0 * * @param string[] $classes Array of the CSS classes that are applied to the menu `<ul>` element. * @param stdClass $args An object of `wp_nav_menu()` arguments. * @param int $depth Depth of menu item. Used for padding. */ $class_names = implode( ' ', apply_filters( 'nav_menu_submenu_css_class', $classes, $args, $depth ) ); $atts = array(); $atts['class'] = ! empty( $class_names ) ? $class_names : ''; /** * Filters the HTML attributes applied to a menu list element. * * @since 6.3.0 * * @param array $atts { * The HTML attributes applied to the `<ul>` element, empty strings are ignored. * * @type string $class HTML CSS class attribute. * } * @param stdClass $args An object of `wp_nav_menu()` arguments. * @param int $depth Depth of menu item. Used for padding. */ $atts = apply_filters( 'nav_menu_submenu_attributes', $atts, $args, $depth ); $attributes = $this->build_atts( $atts ); $output .= "{$n}{$indent}<ul{$attributes}>{$n}"; } /** * Ends the list of after the elements are added. * * @since 3.0.0 * * @see Walker::end_lvl() * * @param string $output Used to append additional content (passed by reference). * @param int $depth Depth of menu item. Used for padding. * @param stdClass $args An object of wp_nav_menu() arguments. */ public function end_lvl( &$output, $depth = 0, $args = null ) { if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) { $t = ''; $n = ''; } else { $t = "\t"; $n = "\n"; } $indent = str_repeat( $t, $depth ); $output .= "$indent</ul>{$n}"; } /** * Starts the element output. * * @since 3.0.0 * @since 4.4.0 The {@see 'nav_menu_item_args'} filter was added. * @since 5.9.0 Renamed `$item` to `$data_object` and `$id` to `$current_object_id` * to match parent class for PHP 8 named parameter support. * @since 6.7.0 Removed redundant title attributes. * * @see Walker::start_el() * * @param string $output Used to append additional content (passed by reference). * @param WP_Post $data_object Menu item data object. * @param int $depth Depth of menu item. Used for padding. * @param stdClass $args An object of wp_nav_menu() arguments. * @param int $current_object_id Optional. ID of the current menu item. Default 0. */ public function start_el( &$output, $data_object, $depth = 0, $args = null, $current_object_id = 0 ) { // Restores the more descriptive, specific name for use within this method. $menu_item = $data_object; if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) { $t = ''; $n = ''; } else { $t = "\t"; $n = "\n"; } $indent = ( $depth ) ? str_repeat( $t, $depth ) : ''; $classes = empty( $menu_item->classes ) ? array() : (array) $menu_item->classes; $classes[] = 'menu-item-' . $menu_item->ID; /** * Filters the arguments for a single nav menu item. * * @since 4.4.0 * * @param stdClass $args An object of wp_nav_menu() arguments. * @param WP_Post $menu_item Menu item data object. * @param int $depth Depth of menu item. Used for padding. */ $args = apply_filters( 'nav_menu_item_args', $args, $menu_item, $depth ); /** * Filters the CSS classes applied to a menu item's list item element. * * @since 3.0.0 * @since 4.1.0 The `$depth` parameter was added. * * @param string[] $classes Array of the CSS classes that are applied to the menu item's `<li>` element. * @param WP_Post $menu_item The current menu item object. * @param stdClass $args An object of wp_nav_menu() arguments. * @param int $depth Depth of menu item. Used for padding. */ $class_names = implode( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $menu_item, $args, $depth ) ); /** * Filters the ID attribute applied to a menu item's list item element. * * @since 3.0.1 * @since 4.1.0 The `$depth` parameter was added. * * @param string $menu_item_id The ID attribute applied to the menu item's `<li>` element. * @param WP_Post $menu_item The current menu item. * @param stdClass $args An object of wp_nav_menu() arguments. * @param int $depth Depth of menu item. Used for padding. */ $id = apply_filters( 'nav_menu_item_id', 'menu-item-' . $menu_item->ID, $menu_item, $args, $depth ); $li_atts = array(); $li_atts['id'] = ! empty( $id ) ? $id : ''; $li_atts['class'] = ! empty( $class_names ) ? $class_names : ''; /** * Filters the HTML attributes applied to a menu's list item element. * * @since 6.3.0 * * @param array $li_atts { * The HTML attributes applied to the menu item's `<li>` element, empty strings are ignored. * * @type string $class HTML CSS class attribute. * @type string $id HTML id attribute. * } * @param WP_Post $menu_item The current menu item object. * @param stdClass $args An object of wp_nav_menu() arguments. * @param int $depth Depth of menu item. Used for padding. */ $li_atts = apply_filters( 'nav_menu_item_attributes', $li_atts, $menu_item, $args, $depth ); $li_attributes = $this->build_atts( $li_atts ); $output .= $indent . '<li' . $li_attributes . '>'; /** This filter is documented in wp-includes/post-template.php */ $title = apply_filters( 'the_title', $menu_item->title, $menu_item->ID ); // Save filtered value before filtering again. $the_title_filtered = $title; /** * Filters a menu item's title. * * @since 4.4.0 * * @param string $title The menu item's title. * @param WP_Post $menu_item The current menu item object. * @param stdClass $args An object of wp_nav_menu() arguments. * @param int $depth Depth of menu item. Used for padding. */ $title = apply_filters( 'nav_menu_item_title', $title, $menu_item, $args, $depth ); $atts = array(); $atts['target'] = ! empty( $menu_item->target ) ? $menu_item->target : ''; $atts['rel'] = ! empty( $menu_item->xfn ) ? $menu_item->xfn : ''; if ( ! empty( $menu_item->url ) ) { if ( $this->privacy_policy_url === $menu_item->url ) { $atts['rel'] = empty( $atts['rel'] ) ? 'privacy-policy' : $atts['rel'] . ' privacy-policy'; } $atts['href'] = $menu_item->url; } else { $atts['href'] = ''; } $atts['aria-current'] = $menu_item->current ? 'page' : ''; // Add title attribute only if it does not match the link text (before or after filtering). if ( ! empty( $menu_item->attr_title ) && trim( strtolower( $menu_item->attr_title ) ) !== trim( strtolower( $menu_item->title ) ) && trim( strtolower( $menu_item->attr_title ) ) !== trim( strtolower( $the_title_filtered ) ) && trim( strtolower( $menu_item->attr_title ) ) !== trim( strtolower( $title ) ) ) { $atts['title'] = $menu_item->attr_title; } else { $atts['title'] = ''; } /** * Filters the HTML attributes applied to a menu item's anchor element. * * @since 3.6.0 * @since 4.1.0 The `$depth` parameter was added. * * @param array $atts { * The HTML attributes applied to the menu item's `<a>` element, empty strings are ignored. * * @type string $title Title attribute. * @type string $target Target attribute. * @type string $rel The rel attribute. * @type string $href The href attribute. * @type string $aria-current The aria-current attribute. * } * @param WP_Post $menu_item The current menu item object. * @param stdClass $args An object of wp_nav_menu() arguments. * @param int $depth Depth of menu item. Used for padding. */ $atts = apply_filters( 'nav_menu_link_attributes', $atts, $menu_item, $args, $depth ); $attributes = $this->build_atts( $atts ); $item_output = $args->before; $item_output .= '<a' . $attributes . '>'; $item_output .= $args->link_before . $title . $args->link_after; $item_output .= '</a>'; $item_output .= $args->after; /** * Filters a menu item's starting output. * * The menu item's starting output only includes `$args->before`, the opening `<a>`, * the menu item's title, the closing `</a>`, and `$args->after`. Currently, there is * no filter for modifying the opening and closing `<li>` for a menu item. * * @since 3.0.0 * * @param string $item_output The menu item's starting HTML output. * @param WP_Post $menu_item Menu item data object. * @param int $depth Depth of menu item. Used for padding. * @param stdClass $args An object of wp_nav_menu() arguments. */ $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $menu_item, $depth, $args ); } /** * Ends the element output, if needed. * * @since 3.0.0 * @since 5.9.0 Renamed `$item` to `$data_object` to match parent class for PHP 8 named parameter support. * * @see Walker::end_el() * * @param string $output Used to append additional content (passed by reference). * @param WP_Post $data_object Menu item data object. Not used. * @param int $depth Depth of page. Not Used. * @param stdClass $args An object of wp_nav_menu() arguments. */ public function end_el( &$output, $data_object, $depth = 0, $args = null ) { if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) { $t = ''; $n = ''; } else { $t = "\t"; $n = "\n"; } $output .= "</li>{$n}"; } /** * Builds a string of HTML attributes from an array of key/value pairs. * Empty values are ignored. * * @since 6.3.0 * * @param array $atts Optional. An array of HTML attribute key/value pairs. Default empty array. * @return string A string of HTML attributes. */ protected function build_atts( $atts = array() ) { $attribute_string = ''; foreach ( $atts as $attr => $value ) { if ( false !== $value && '' !== $value && is_scalar( $value ) ) { $value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value ); $attribute_string .= ' ' . $attr . '="' . $value . '"'; } } return $attribute_string; } }