Question

我正在尝试使用自定义助手来返回带有自定义导航菜单项的页面缩略图。我的完整助行器在下面，似乎是本节

$thumbnail = '';
if( $id = has_post_thumbnail( (int)$item->object_id ) ) {
$thumbnail = get_the_post_thumbnail( $id );
}

没有拉页面ID，所以我没有缩略图。任何帮助表示赞赏

/*
* Create HTML list of nav menu items.
* Replacement for the native Walker, using the description.
*
* @see    http://wordpress.stackexchange.com/q/14037/
* @author toscho, http://toscho.de
*/
class Thumbnail_Walker extends Walker_Nav_Menu
{
/**
* Start the element output.
*
* @param  string $output Passed by reference. Used to append additional content.
* @param  object $item   Menu item data object.
* @param  int $depth     Depth of menu item. May be used for padding.
* @param  array $args    Additional strings.
* @return void
*/
function start_el(&$output, $item, $depth, $args)
{
$classes     = empty ( $item->classes ) ? array () : (array) $item->classes;

$class_names = join(
    ' '
,   apply_filters(
        'nav_menu_css_class'
    ,   array_filter( $classes ), $item
    )
);

! empty ( $class_names )
    and $class_names = ' class="'. esc_attr( $class_names ) . '"';

$output .= "<li id='menu-item-$item->ID' $class_names>";

$attributes  = '';

! empty( $item->attr_title )
    and $attributes .= ' title="'  . esc_attr( $item->attr_title ) .'"';
! empty( $item->target )
    and $attributes .= ' target="' . esc_attr( $item->target     ) .'"';
! empty( $item->xfn )
    and $attributes .= ' rel="'    . esc_attr( $item->xfn        ) .'"';
! empty( $item->url )
    and $attributes .= ' href="'   . esc_attr( $item->url        ) .'"';

// insert thumbnail
// you may change this
$thumbnail = '';
if( $id = has_post_thumbnail( (int)$item->object_id ) ) {
    $thumbnail = get_the_post_thumbnail( $id );
}

$title = apply_filters( 'the_title', $item->title, $item->ID );

$item_output = $args->before
    . "<a $attributes>"
    . $args->link_before
    . $title
    . '</a> '
    . $args->link_after
    . $thumbnail
    . $args->after;

// Since $output is called by reference we don't need to return anything.
$output .= apply_filters(
    'walker_nav_menu_start_el'
,   $item_output
,   $item
,   $depth
,   $args
);
}
}

Answer 1

根据http://phpdoc.wordpress.org 看起来您可以在$id之后将start_el参数添加到$args函数中，如下所示：

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

如何在自定义walker中返回页面ID

1 个答案: