WordPress Custom Walker für Thumbnails mit benutzerdefiniertem Menü

Ichbin nochein Anfängerin PHP,daher wirdjede Hilfe sehrgeschätzt. Normalerweise habeichfestgestellt,dass der Codex sehr hilfreichist,aberes scheint,dassbenutzerdefinierte Walker außerhalb seines Anwendungsbereichs liegen.

Ichmöchte,dass Miniaturansichtenin einembenutzerdefinierten Navigationsmenü angezeigt werden,dasichin einem Thema habe. Soweitich weiß,mussicheinen benutzerdefinierten Walkererstellen,um dies zuerreichen.

Ich habe diesplatziert

 wp_nav_menu( array( 'container_class' => 'menu-stamp', 'theme_location' =>'stamp-menu' , 'walker' => new Thumbnail_Walker) ); 
 

in meinem Themenmenü undfügte die 3 Miniaturansichten unter dem Elementausgabeabschnitt unter

 /*
 * 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
    );
   }
}
 

Icherhalteeine Fehlermeldungfür unerwartet} am Ende des Miniaturbildcodes,daheristesfalsch,aberichbin mirnicht sicher warum.

I'm still very novice at PHP so any help is greatly appreciated. Typically I have found the codex to be very helpful but it appears custom walkers may be outside its scope.

I'd like to have thumbnails show in a custom nav menu which I have in a theme. From what I understand I need to create a custom walker to accomplish this.

I've placed this

wp_nav_menu( array( 'container_class' => 'menu-stamp', 'theme_location' =>'stamp-menu' , 'walker' => new Thumbnail_Walker) ); 

in my theme menu location and inserted the 3 thumbnail lines below the item output section below

/*
 * 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
    );
   }
}

I get an error for unexpected } at the end of the thumbnail code so its wrong but I'm not sure why.