在PHP Wordpress函数的菜单项上按类别循环发布

Question

首先，90％的代码工作只需要一点点推动：D

一切都在functions.php内完成

我在标题菜单中添加了一个项目，它需要动态显示特定类别中的一些帖子。

我正在使用下面的功能获取帖子，这些功能是根据我的需要从这里获取和修改的

 function get_latest_post_thumbnails_urls() {
    // Set an empty variable which will hold our array of URL's
    $output = [];

    // Set our query args
    $args = [
        'posts_per_page' => 3,
        'fields'         => 'ids', // Only get post ID's
        'meta_query'     => [ // Get posts which has thumbnails only
            [
                'key'     => '_thumbnail_id',
                'compare' => 'EXISTS'
            ]
        ],
        'cat' => '5'
        // Any additional parameters you might need
    ];
    $q = get_posts( $args );

    // ALWAYS make sure we have posts, else return $output
    if ( !$q )
        return $output;

    // Ok, we have posts, lets loop through them and create an array of URL's
    foreach ( $q as $id ) 
        $output[] = wp_get_attachment_url( get_post_thumbnail_id( $id ) );

    // Return our array
    return $output;

}

然后我使用下面的函数添加菜单项（ 从这里改编 ），但变量在循环期间没有显示在正确的位置。 <li>需要在<ul> 。

add_filter('wp_nav_menu_items', 'add_admin_link', 10, 2);
function add_admin_link($items, $args){

    if( $args->theme_location == 'main_menu' ){
        $items .= '<li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children dropdown menu-item-1441">
        <a class="sf-with-ul" title="Eventos" href="/eventos/"><span class="link-inner">EVENTOS <span class="nav-arrow top-level fa fa-angle-down"></span></span></a>

        <ul class="sub-menu" style="display: none;">'.
        $urls = get_latest_post_thumbnails_urls();
        if ( $urls ) {
                foreach ( $urls as $url ) {
                    // Do something with your thumbnail url
                    echo '<li>'. $url .'</li>';// For testing, remove this
                }
            }
        '</ul>
        </li>';
    }
    return $items;
}

正如您在图像中看到的那样，该函数获取所有正确的信息，但它在菜单项之前显示它。

////////////////新代码帮助//////////////////

add_filter('wp_nav_menu_items', 'add_admin_link', 10, 2);
function add_admin_link($items, $args){
    if( $args->theme_location == 'main_menu' ){
        //add your first few elements to the $items variable
        $items .= '<li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children dropdown menu-item-1441">';
        $items .= '<a class="sf-with-ul" title="Eventos" href="/eventos/"><span class="link-inner">EVENTOS <span class="nav-arrow top-level fa fa-angle-down"></span></span></a>';
        $items .= '<ul class="sub-menu" style="display: none;">';


            $args = array(
                'post_type' => 'post',
                'posts_per_page' => -1,
                'cat' => '5'
            );

            $post_query = new WP_Query($args);
        if($post_query->have_posts() ) {
          while($post_query->have_posts() ) {
            $post_query->the_post();

            $items .= '<h2>'. the_title() .'</h2>';

          }
        };


        //close the dom elements
        $items .= '</ul>';
        $items .= '</li>';
    }
    //return the final product

Answer 1

您正在处理的错误正在发生，因为您在返回菜单项之前回显了$url变量。

要解决这个问题，不要回显循环中的url，而是将它们添加到$items变量（使用.=就像之前所做的那样），然后像你已经做的那样返回$items 。

add_filter('wp_nav_menu_items', 'add_admin_link', 10, 2);
function add_admin_link($items, $args){
    if( $args->theme_location == 'main_menu' ){
        //add your first few elements to the $items variable
        $items .= '<li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children dropdown menu-item-1441">';
        $items .= '<a class="sf-with-ul" title="Eventos" href="/eventos/"><span class="link-inner">EVENTOS <span class="nav-arrow top-level fa fa-angle-down"></span></span></a>';
        $items .= '<ul class="sub-menu" style="display: none;">';
        $urls = get_latest_post_thumbnails_urls();
        if ( $urls ) {
            //loop through your url's
            foreach ( $urls as $url ) {
                //add each url onto the $items variable
                $items .= '<li>'. $url .'</li>';
            }
        }
        //close the dom elements
        $items .= '</ul>';
        $items .= '</li>';
    }
    //return the final product
    return $items;
}

您还可以通过在菜单过滤器中运行WP_Query，将两个函数组合成单个函数。

这样做可以更容易地在菜单项中添加其他帖子信息。

这是一个添加特色图像的示例，包含在帖子的链接中，帖子标题被添加为链接的标题属性：

add_filter('wp_nav_menu_items', 'add_admin_link', 10, 2);
function add_admin_link($items, $args){
    if( $args->theme_location == 'main_menu' ){
        //add your first few elements to the $items variable
        $items .= '<li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children dropdown menu-item-1441">';
        $items .= '<a class="sf-with-ul" title="Eventos" href="/eventos/"><span class="link-inner">EVENTOS <span class="nav-arrow top-level fa fa-angle-down"></span></span></a>';
        $items .= '<ul class="sub-menu" style="display: none;">';
        $urls = get_latest_post_thumbnails_urls();

        //build you arguments for the wp query
        $args = array(
            'post_type'     => 'post',
            'posts_per_page'=> -1,
            'tax_query' => array( //only get posts in category 5
                array(
                    'taxonomy' => 'category',
                    'field'    => 'term_id',
                    'terms'    => 5,
                ),
            ),
            'meta_query' => array( //only get posts that have a thumbnail
                array(
                    'key' => '_thumbnail_id',
                    'compare' => 'EXISTS'
                ),
            )
        );

        //create the query and loop through it
        $query = new WP_Query($args);
        if($query->have_posts()) {
            while($query->have_posts()) {
                $query->the_post();
                $thumbnail_id   = get_post_thumbnail_id(); //get the thumbnail id
                $image_src      = wp_get_attachment_image_src($thumbnail_id, 'full')[0]; //you can use either full/large/medium/thumbnail
                $items        .= '<li><a href="'.get_the_permalink().'" title="'.get_the_title().'"><img src="'.$image_src.'"></a></a></li>';
            }
        }
        wp_reset_postdata();

        //close the dom elements
        $items .= '</ul>';
        $items .= '</li>';
    }
    //return the final product
    return $items;
}

Answer 2

用于循环发布字段ID的函数

function get_latest_post_thumbnails_urls()
{
    // Set an empty variable which will hold our array of URL's
    $output = [];

    // Set our query args
    $args = [
        'posts_per_page' => -1,
        'fields'         => 'ids', // Only get post ID's
        'meta_query'     => [ // Get posts which has thumbnails only
            [
                'key'     => '_thumbnail_id',
                'compare' => 'EXISTS'
            ]
        ],
        'cat' => '5'
        // Any additional parameters you might need
    ];
    $q = get_posts( $args );

    // ALWAYS make sure we have posts, else return $output
    if ( !$q )
        return $output;

    // Ok, we have posts, lets loop through them and create an array of URL's
    foreach ( $q as $id ) 
        $output[] = $id;

    // Return our array
    return $output;

}

用于显示菜单项的功能

function add_admin_link($items, $args){
    if( $args->theme_location == 'main_menu' ){
        //add your first few elements to the $items variable
        $items .= '<li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children dropdown menu-item-1441">';
        $items .= '<a class="sf-with-ul" title="Eventos" href="/eventos/"><span class="link-inner">EVENTOS <span class="nav-arrow top-level fa fa-angle-down"></span></span></a>';
        $items .= '<ul class="sub-menu" style="display: none;">';

        $urls = get_latest_post_thumbnails_urls();
        if ( $urls ) {
            //loop through your url's
            foreach ( $urls as $url ) {
                //add each url onto the $items variable
                $items .= '<li><a href="'. get_permalink($url) .'"><span class="link-inner">'. get_the_title($url) .'</span></a></li>';
            }
        }

        //close the dom elements
        $items .= '</ul>';
        $items .= '</li>';
    }
    //return the final product
    return $items;
}

用于在菜单中定位菜单项的功能

add_filter( 'wp_nav_menu_objects', 'restructure_menu_links', 10, 2 );

function restructure_menu_links( $reorgitems, $args ) {

    $new_links = array();

    $label = add_admin_link($items, $args);    // add your custom menu item content here

    // Create a nav_menu_item object
    $item = array(
        'title'            => $label,
        'menu_item_parent' => 0,
        'ID'               => 'hidden',
        'db_id'            => '',
        'url'              => $link,
        'classes'          => array( 'menu-item' )
    );

    $new_links[] = (object) $item; // Add the new menu item to our array

    // insert item
    $location = 2;   // insert at 3rd place
    array_splice( $reorgitems, $location, 0, $new_links );

    return $reorgitems;
}

我知道这不是完美的但我感谢@Frits的帮助我最终让它按照我的方式工作_ :)

你的好处是让它变得更好;）