WordPress自定义3级超级菜单 _网站开发

我在没有插件的情况下在Wordpress中执行3级自定义超级菜单时遇到问题。现在它是静态HTML, 但我希望它在PHP中动态。我的header.php代码如下所示：

< !-- START offcanvas --> < div class="offcanvas visible-xs-block visible-sm-block"> < a href="http://www.srcmini.com/#" class="mobile-nav-toggle"> < /a> < nav> < li> < a href="http://www.srcmini.com/#dropdown-angebote" data-toggle="collapse" class="has-dropdown"> Unser Angebot< /a> < /li> < li> < a href="http://www.srcmini.com/das-magazin"> Das Magazin< /a> < /li> < li> < a href="http://www.srcmini.com/reservisten-vor-ort"> Reservisten vor Ort< /a> < /li> < li> < a href="http://www.srcmini.com/der-verband"> Der Verband< /a> < /li> < li> < a href="http://www.srcmini.com/#"> Mitgliedschaft< /a> < /li> < /nav> < nav class="visible-xs-block"> < ?php wp_header_meta_nav(); ?> < li> < a href="http://www.srcmini.com/#" class="icon-search"> < svg width="18" height="18"> < image xlink:href="http://www.srcmini.com/< ?php echo get_template_directory_uri(); ?> /dist/img/icon-search.svg" src="http://www.srcmini.com/< ?php echo get_template_directory_uri(); ?> /dist/img/icon-search.png" width="18" height="18"/> < /svg> < ?php _e( 'Suche', 'reservistenverband' ) ?> < /a> < /li> < li> < a href="http://www.srcmini.com/#" class="btn btn--yellow text-uppercase"> < ?php _e( 'Mitglied werden', 'reservistenverband' ) ?> < /a> < /li> < li> < a href="http://www.srcmini.com/#" class="text-uppercase"> < ?php _e( 'Login', 'reservistenverband' ) ?> < /a> < /li> < /nav> < /div> < !-- END offcanvas --> < !-- START Header-Dropdowns --> < div class="header-dropdowns"> < div class="header-dropdown collapse" id="dropdown-angebote"> < a href="http://www.srcmini.com/#" class="dropdown-close visible-xs-block visible-sm-block"> < /a> < div class="container"> < div class="row"> < div class="col-md-4 col-left"> < ul> < li> < a href="http://www.srcmini.com/veranstaltungen"> Veranstaltungen< /a> < /li> < li> < a data-toggle="collapse" href="http://www.srcmini.com/#dropdown-truppe" class="has-dropdown"> Reservisten in der Truppe< /a> < /li> < li> < a href="http://www.srcmini.com/#"> Internationale Arbeit< /a> < /li> < li> < a data-toggle="collapse" href="http://www.srcmini.com/#dropdown-ausbildung" class="has-dropdown"> Milit?rische Aus-und Weiterbildung< /a> < /li> < li> < a href="http://www.srcmini.com/#"> ?ffentlichkeitsarbeit< /a> < /li> < li> < a data-toggle="collapse" href="http://www.srcmini.com/#dropdown-sicherheitspolitisch" class="has-dropdown"> Sicherheitspolitische Arbeit< /a> < /li> < li> < a href="http://www.srcmini.com/#"> Verbandsarbeit< /a> < /li> < /ul> < /div> < div class="col-md-4 col-right"> < div class="header-sub-dropdown collapse" id="dropdown-ausbildung"> < a href="http://www.srcmini.com/#" class="dropdown-close visible-xs-block visible-sm-block"> < /a> < ul> < li> < a href="http://www.srcmini.com/unser-angebot/militaerische-aus-und-weiterbildung/taktik"> Taktik< /a> < /li> < li> < a href="http://www.srcmini.com/unser-angebot/militaerische-aus-und-weiterbildung/fernmeldeausbildung"> Fernmeldeausbildung< /a> < /li> < li> < a href="http://www.srcmini.com/unser-angebot/militaerische-aus-und-weiterbildung/schiessen"> Schie?en< /a> < /li> < li> < a href="http://www.srcmini.com/unser-angebot/militaerische-aus-und-weiterbildung/agshp"> AGSHP< /a> < /li> < li> < a href="http://www.srcmini.com/unser-angebot/militaerische-aus-und-weiterbildung/sanitaerausbildung"> Sanit?rausbildung< /a> < /li> < li> < a href="http://www.srcmini.com/unser-angebot/militaerische-aus-und-weiterbildung/gefechtdienst"> Gefechtsdienst< /a> < /li> < /ul> < /div> < /div> < div class="col-md-4 col-teaser"> < div class="tt tt--black"> < div class="tt__content"> < span class="tt__title text-uppercase"> Unser Angebot< /span> < p class="tt__text"> Pro Hauptnavigationspunkt kann hier< br/> ein besonderes Thema hervorgehoben und angeteasert werden.< /p> < a href="http://www.srcmini.com/#" class="btn btn--dark-blue btn--big text-uppercase tt__btn--bottom"> Mehr dazu< /a> < /div> < /div> < /div> < /div> < /div> < /div> < /div> < !-- END Header-Dropdowns --> < !-- START Search --> < div class="fullscreen-search search"> < div class="search__overlay"> < /div> < div class="search__form"> < div class="container"> < a href="http://www.srcmini.com/#" class="search__close"> < /a> < !--< h3 class="text-uppercase"> Suche< /h3> --> < form action=""> < input type="text" class="search__input" placeholder="Schlagwort hier eingeben..."/> < /form> < /div> < /div> < /div> < !-- END Search --> < div class="page-wrapper"> < !-- START main-header --> < header class="main-header"> < div class="pre-nav hidden-xs"> < div class="container"> < nav> < ?php wp_header_meta_nav(); ?> < li> < button class="icon-search"> < svg width="18" height="18"> < image xlink:href="http://www.srcmini.com/< ?php echo get_template_directory_uri(); ?> /dist/img/icon-search.svg" src="http://www.srcmini.com/< ?php echo get_template_directory_uri(); ?> /dist/img/icon-search.png" width="18" height="18"/> < /svg> < /button> < /li> < li> < a href="http://www.srcmini.com/#" class="btn btn--yellow text-uppercase"> < ?php _e( 'Mitglied werden', 'reservistenverband' ) ?> < /a> < /li> < li> < a href="http://www.srcmini.com/#" class="text-uppercase"> < ?php _e( 'Login', 'reservistenverband' ) ?> < /a> < /li> < /nav> < /div> < /div> < div class="main-nav"> < div class="container"> < a href="http://www.srcmini.com/#" class="mobile-nav-toggle visible-xs-block visible-sm-block"> < span> < /span> < span> < /span> < span> < /span> < /a> < div class="row"> < div class="col-md-3"> < a href="http://www.srcmini.com/< ?php bloginfo('url' ); ?> "> < object type="image/svg+xml" data="http://www.srcmini.com/< ?php echo get_template_directory_uri(); ?> /dist/img/logo.svg"> < img src="http://www.srcmini.com/< ?php echo get_template_directory_uri(); ?> /dist/img/logo.png" alt="No SVG support"> < /object> < /a> < /div> < div class="col-md-9"> < nav class="hidden-sm hidden-xs"> < li> < a href="http://www.srcmini.com/#dropdown-angebote" data-toggle="collapse" class="text-uppercase has-dropdown"> Unser Angebot< /a> < /li> < li> < a href="http://www.srcmini.com/#" class="text-uppercase"> Das Magazin< /a> < /li> < li> < a href="http://www.srcmini.com/#" class="text-uppercase"> Reservisten vor Ort< /a> < /li> < li> < a href="http://www.srcmini.com/#" class="text-uppercase"> Der Verband< /a> < /li> < li> < a href="http://www.srcmini.com/#" class="text-uppercase"> Mitgliedschaft< /a> < /li> < ?php //wp_header_main_nav() ?> < /nav> < /div> < /div> < /div> < /div> < /header> < /div> < !-- END main-header -->

【WordPress自定义3级超级菜单】我只想让WP-Backend中的菜单与PHP一起使用。我不知道如何用PHP编写自定义WP nav walker。感谢你的任何建议。
#1检查这个例子,