PHP 7.2 更新：header 中下拉菜单的警告声明

Question

我刚刚将我的 1and1 帐户更新到 php 7.2。因为，我在我的 wordpress 网站的 header 上有这些警告：

Warning: Declaration of DropDown_Nav_Menu::start_lvl(&$output, $depth) should be compatible with Walker_Nav_Menu::start_lvl(&$output, $depth = 0, $args = Array) in /homepages/42/d459723492/htdocs/com/wp-content/themes/bluediamond-v1_02/include/plugin/dropdown-menus.php on line 173

Warning: Declaration of DropDown_Nav_Menu::end_lvl(&$output, $depth) should be compatible with Walker_Nav_Menu::end_lvl(&$output, $depth = 0, $args = Array) in /homepages/42/d459723492/htdocs/com/wp-content/themes/bluediamond-v1_02/include/plugin/dropdown-menus.php on line 173

Warning: Declaration of DropDown_Nav_Menu::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /homepages/42/d459723492/htdocs/com/wp-content/themes/bluediamond-v1_02/include/plugin/dropdown-menus.php on line 173

Warning: Declaration of DropDown_Nav_Menu::end_el(&$output, $item, $depth) should be compatible with Walker_Nav_Menu::end_el(&$output, $item, $depth = 0, $args = Array) in /homepages/42/d459723492/htdocs/com/wp-content/themes/bluediamond-v1_02/include/plugin/dropdown-menus.php on line 173

函数如下：

function start_el( &$output, $item, $depth, $args ) {
        global $wp_query;
        $indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

        $class_names = $value = '';

        $classes = empty( $item->classes ) ? array() : (array) $item->classes;
        $classes[] = 'menu-item-' . $item->ID;
        $classes[] = 'menu-item-depth-' . $depth;

        $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_unique( array_filter( $classes ) ), $item, $args ) );
        $class_names = ' class="' . esc_attr( $class_names ) . '"';

        // select current item
        $selected = in_array( 'current-menu-item', $classes ) ? ' selected="selected"' : '';

        $output .= $indent . '<option' . $class_names .' value="'. $item->url .'"'. $selected .'>';

        // push sub-menu items in as we can't nest optgroups
        $indent_string = str_repeat( apply_filters( 'dropdown_menus_indent_string', $args->indent_string, $item, $depth, $args ), ( $depth ) ? $depth : 0 );
        $indent_string .= !empty( $indent_string ) ? apply_filters( 'dropdown_menus_indent_after', $args->indent_after, $item, $depth, $args ) : '';

        $item_output = $args->before . $indent_string;
        $item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
        $item_output .= $args->after;

        $output .= apply_filters( 'walker_nav_menu_dropdown_start_el', $item_output, $item, $depth, $args );
    }

    /**
     * @see Walker::end_el()
     * @since 3.0.0
     *
     * @param string $output Passed by reference. Used to append additional content.
     * @param object $item Page data object. Not used.
     * @param int $depth Depth of page. Not Used.
     */
    function end_el( &$output, $item, $depth ) {
        $output .= apply_filters( 'walker_nav_menu_dropdown_end_el', "</option>\n", $item, $depth);
    }
}

我尝试解决问题但没有成功，你有什么想法吗？

Answer 1

子方法 class 中的方法应与父方法具有完全相同的结构，包括默认值。

您可以仔细检查 Walker_Nav_Menu 源代码在 WordPress 核心中的样子 - https://developer.wordpress.org/reference/classes/walker_nav_menu/。

对于您的情况，您必须更改两件事：

function start_el( &$output, $item, $depth, $args ) {

到

function start_el( &$output, $depth = 0, $args = array() ) {

以及其他应该替换的东西：

function end_el( &$output, $item, $depth ) {

到

function end_el( &$output, $depth = 0, $args = array() ) {

PHP 7.2 更新：header 中下拉菜单的警告声明

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