+ return call_user_func_array(array($walker, 'walk'), $args);
+}
+
+/**
+ * Create HTML list of pages.
+ *
+ * @since 2.1.0
+ * @uses Walker
+ */
+class Walker_Page extends Walker {
+ /**
+ * @see Walker::$tree_type
+ * @since 2.1.0
+ * @var string
+ */
+ public $tree_type = 'page';
+
+ /**
+ * @see Walker::$db_fields
+ * @since 2.1.0
+ * @todo Decouple this.
+ * @var array
+ */
+ public $db_fields = array ('parent' => 'post_parent', 'id' => 'ID');
+
+ /**
+ * @see Walker::start_lvl()
+ * @since 2.1.0
+ *
+ * @param string $output Passed by reference. Used to append additional content.
+ * @param int $depth Depth of page. Used for padding.
+ * @param array $args
+ */
+ public function start_lvl( &$output, $depth = 0, $args = array() ) {
+ $indent = str_repeat("\t", $depth);
+ $output .= "\n$indent<ul class='children'>\n";
+ }
+
+ /**
+ * @see Walker::end_lvl()
+ * @since 2.1.0
+ *
+ * @param string $output Passed by reference. Used to append additional content.
+ * @param int $depth Depth of page. Used for padding.
+ * @param array $args
+ */
+ public function end_lvl( &$output, $depth = 0, $args = array() ) {
+ $indent = str_repeat("\t", $depth);
+ $output .= "$indent</ul>\n";
+ }
+
+ /**
+ * @see Walker::start_el()
+ * @since 2.1.0
+ *
+ * @param string $output Passed by reference. Used to append additional content.
+ * @param object $page Page data object.
+ * @param int $depth Depth of page. Used for padding.
+ * @param int $current_page Page ID.
+ * @param array $args
+ */
+ public function start_el( &$output, $page, $depth = 0, $args = array(), $current_page = 0 ) {
+ 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 ) ) {
+ $_current_page = get_post( $current_page );
+ if ( $_current_page && in_array( $page->ID, $_current_page->ancestors ) ) {
+ $css_class[] = 'current_page_ancestor';
+ }
+ if ( $page->ID == $current_page ) {
+ $css_class[] = 'current_page_item';
+ } elseif ( $_current_page && $page->ID == $_current_page->post_parent ) {
+ $css_class[] = 'current_page_parent';
+ }
+ } elseif ( $page->ID == get_option('page_for_posts') ) {
+ $css_class[] = 'current_page_parent';
+ }
+
+ /**
+ * Filter the list of CSS classes to include with each page item in the list.
+ *
+ * @since 2.8.0
+ *
+ * @see wp_list_pages()
+ *
+ * @param array $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 of the current page.
+ */
+ $css_classes = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page ) );
+
+ if ( '' === $page->post_title ) {
+ $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'];
+
+ /** This filter is documented in wp-includes/post-template.php */
+ $output .= $indent . sprintf(
+ '<li class="%s"><a href="%s">%s%s%s</a>',
+ $css_classes,
+ get_permalink( $page->ID ),
+ $args['link_before'],
+ apply_filters( 'the_title', $page->post_title, $page->ID ),
+ $args['link_after']
+ );
+
+ if ( ! empty( $args['show_date'] ) ) {
+ if ( 'modified' == $args['show_date'] ) {
+ $time = $page->post_modified;
+ } else {
+ $time = $page->post_date;
+ }
+
+ $date_format = empty( $args['date_format'] ) ? '' : $args['date_format'];
+ $output .= " " . mysql2date( $date_format, $time );
+ }
+ }
+
+ /**
+ * @see Walker::end_el()
+ * @since 2.1.0
+ *
+ * @param string $output Passed by reference. Used to append additional content.
+ * @param object $page Page data object. Not used.
+ * @param int $depth Depth of page. Not Used.
+ * @param array $args
+ */
+ public function end_el( &$output, $page, $depth = 0, $args = array() ) {
+ $output .= "</li>\n";
+ }
+
+}
+
+/**
+ * Create HTML dropdown list of pages.
+ *
+ * @since 2.1.0
+ * @uses Walker
+ */
+class Walker_PageDropdown extends Walker {
+ /**
+ * @see Walker::$tree_type
+ * @since 2.1.0
+ * @var string
+ */
+ public $tree_type = 'page';
+
+ /**
+ * @see Walker::$db_fields
+ * @since 2.1.0
+ * @todo Decouple this
+ * @var array
+ */
+ public $db_fields = array ('parent' => 'post_parent', 'id' => 'ID');
+
+ /**
+ * @see Walker::start_el()
+ * @since 2.1.0
+ *
+ * @param string $output Passed by reference. Used to append additional content.
+ * @param object $page Page data object.
+ * @param int $depth Depth of page in reference to parent pages. Used for padding.
+ * @param array $args Uses 'selected' argument for selected page to set selected HTML attribute for option element.
+ * @param int $id
+ */
+ public function start_el( &$output, $page, $depth = 0, $args = array(), $id = 0 ) {
+ $pad = str_repeat(' ', $depth * 3);
+
+ $output .= "\t<option class=\"level-$depth\" value=\"$page->ID\"";
+ if ( $page->ID == $args['selected'] )
+ $output .= ' selected="selected"';
+ $output .= '>';
+
+ $title = $page->post_title;
+ if ( '' === $title ) {
+ $title = sprintf( __( '#%d (no title)' ), $page->ID );
+ }
+
+ /**
+ * Filter the page title when creating an HTML drop-down list of pages.
+ *
+ * @since 3.1.0
+ *
+ * @param string $title Page title.
+ * @param object $page Page data object.
+ */
+ $title = apply_filters( 'list_pages', $title, $page );
+ $output .= $pad . esc_html( $title );
+ $output .= "</option>\n";
+ }