
了解数据库技术:SQLite与MySQL的比较
wp_dropdown_pages ( $args = '' )
wp_dropdown_pages: 这个函数用来显示WordPress网站中的页面下拉菜单: 这个函数可以用来让用户导航到不同的页面,并且可以自定义包括不同的显示选项和参数。
检索或显示一个下拉的页面列表(选择列表)。
function wp_dropdown_pages( $args = '' ) { $defaults = array( 'depth' => 0, 'child_of' => 0, 'selected' => 0, 'echo' => 1, 'name' => 'page_id', 'id' => '', 'class' => '', 'show_option_none' => '', 'show_option_no_change' => '', 'option_none_value' => '', 'value_field' => 'ID', ); $parsed_args = wp_parse_args( $args, $defaults ); $pages = get_pages( $parsed_args ); $output = ''; // Back-compat with old system where both id and name were based on $name argument. if ( empty( $parsed_args['id'] ) ) { $parsed_args['id'] = $parsed_args['name']; } if ( ! empty( $pages ) ) { $class = ''; if ( ! empty( $parsed_args['class'] ) ) { $class = " class='" . esc_attr( $parsed_args['class'] ) . "'"; } $output = "<select name='" . esc_attr( $parsed_args['name'] ) . "'" . $class . " id='" . esc_attr( $parsed_args['id'] ) . "'>n"; if ( $parsed_args['show_option_no_change'] ) { $output .= "t<option value="-1">" . $parsed_args['show_option_no_change'] . "</option>n"; } if ( $parsed_args['show_option_none'] ) { $output .= "t<option value="" . esc_attr( $parsed_args['option_none_value'] ) . '">' . $parsed_args['show_option_none'] . "</option>n"; } $output .= walk_page_dropdown_tree( $pages, $parsed_args['depth'], $parsed_args ); $output .= "</select>n"; } /** * Filters the HTML output of a list of pages as a dropdown. * * @since 2.1.0 * @since 4.4.0 `$parsed_args` and `$pages` added as arguments. * * @param string $output HTML output for dropdown list of pages. * @param array $parsed_args The parsed arguments array. See wp_dropdown_pages() * for information on accepted arguments. * @param WP_Post[] $pages Array of the page objects. */ $html = apply_filters( 'wp_dropdown_pages', $output, $parsed_args, $pages ); if ( $parsed_args['echo'] ) { echo $html; } return $html; }