Walker_Nav_Menu::start_el( string $output, WP_Post $data_object, int $depth, stdClass $args = null, int $current_object_id )

Source

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 );
}

View all references View on Trac View on GitHub