wp-includes/class-walker-nav-menu.php:139Starts the element output.
$outputstring$data_objectWP_Post$depthintoptional0$argsstdClassoptionalnull$current_object_idintoptional08 hooks fire while Walker_Nav_Menu::start_el() runs, in this order:
Filters the arguments for a single nav menu item.
Filters the CSS classes applied to a menu item's list item element.
Filters the ID attribute applied to a menu item's list item element.
Filters the HTML attributes applied to a menu's list item element.
Filters the HTML attributes applied to a menu item's anchor element.
Filters a menu item's starting output.
public function start_el( &$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 );Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-walker-nav-menu.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.