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Description

Outputs the beginning of the current element in the tree.

Usage

Walker_Page::start_el( $output, $data_object, $depth, $args, $current_object_id );

Parameters

$output

( string ) required – Used to append additional content. Passed by reference.

$data_object

( WP_Post ) required – Page data object.

$depth

( int ) optional – Optional. Depth of page. Used for padding. Default 0.

$args

( array ) optional – Optional. Array of arguments. Default empty array.

$current_object_id

( int ) optional – Optional. ID of the current page. Default 0.

Returns

void

Source

File name: wordpress/wp-includes/class-walker-page.php
Lines:

  public function start_el( &$output, $data_object, $depth = 0, $args = array(), $current_object_id = 0 ) {
    // Restores the more descriptive, specific name for use within this method.
    $page            = $data_object;
    $current_page_id = $current_object_id;

    if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
      $t = "\t";
      $n = "\n";
    } else {
      $t = '';
      $n = '';
    }
    if ( $depth ) {
      $indent = str_repeat( $t, $depth );
    } else {
      $indent = '';
    }

    $css_class = array( 'page_item', 'page-item-' . $page->ID );

    if ( isset( $args['pages_with_children'][ $page->ID ] ) ) {
      $css_class[] = 'page_item_has_children';
    }

    if ( ! empty( $current_page_id ) ) {
      $_current_page = get_post( $current_page_id );

      if ( $_current_page && in_array( $page->ID, $_current_page->ancestors, true ) ) {
        $css_class[] = 'current_page_ancestor';
      }

      if ( $page->ID == $current_page_id ) {
        $css_class[] = 'current_page_item';
      } elseif ( $_current_page && $page->ID === $_current_page->post_parent ) {
        $css_class[] = 'current_page_parent';
      }
    } elseif ( get_option( 'page_for_posts' ) == $page->ID ) {
      $css_class[] = 'current_page_parent';
    }

    
/**
 * Filters the list of CSS classes to include with each page item in the list.
 *
 * @since 2.8.0
 *
 * @see wp_list_pages()
 *
 * @param string[] $css_class       An array of CSS classes to be applied to each list item.
 * @param WP_Post  $page            Page data object.
 * @param int      $depth           Depth of page, used for padding.
 * @param array    $args            An array of arguments.
 * @param int      $current_page_id ID of the current page.
 */
    $css_classes = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page_id ) );
    $css_classes = $css_classes ? ' class="' . esc_attr( $css_classes ) . '"' : '';

    if ( '' === $page->post_title ) {
      /* translators: %d: ID of a post. */
      $page->post_title = sprintf( __( '#%d (no title)' ), $page->ID );
    }

    $args['link_before'] = empty( $args['link_before'] ) ? '' : $args['link_before'];
    $args['link_after']  = empty( $args['link_after'] ) ? '' : $args['link_after'];

    $atts                 = array();
    $atts['href']         = get_permalink( $page->ID );
    $atts['aria-current'] = ( $page->ID == $current_page_id ) ? 'page' : '';

    
/**
 * Filters the HTML attributes applied to a page menu item's anchor element.
 *
 * @since 4.8.0
 *
 * @param array $atts {
 *     The HTML attributes applied to the menu item's `<a>` element, empty strings are ignored.
 *
 *     @type string $href         The href attribute.
 *     @type string $aria-current The aria-current attribute.
 * }
 * @param WP_Post $page            Page data object.
 * @param int     $depth           Depth of page, used for padding.
 * @param array   $args            An array of arguments.
 * @param int     $current_page_id ID of the current page.
 */
    $atts = apply_filters( 'page_menu_link_attributes', $atts, $page, $depth, $args, $current_page_id );

    $attributes = '';
    foreach ( $atts as $attr => $value ) {
      if ( is_scalar( $value ) && '' !== $value && false !== $value ) {
        $value       = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
        $attributes .= ' ' . $attr . '="' . $value . '"';
      }
    }

    $output .= $indent . sprintf(
      '<li%s><a%s>%s%s%s</a>',
      $css_classes,
      $attributes,
      $args['link_before'],
      
/** This filter is documented in wp-includes/post-template.php */
 

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