作者： admin

<?php
add_action('init', 'cp_change_post_object');
// Change dashboard Posts to News
function cp_change_post_object() {
    $get_post_type = get_post_type_object('post');
    $labels = $get_post_type->labels;
    //$labels->name = 'News';
    $labels->singular_name = '新闻资讯';
    // $labels->add_new = 'Add News';
    // $labels->add_new_item = 'Add News';
    // $labels->edit_item = 'Edit News';
    // $labels->new_item = 'News';
    // $labels->view_item = 'View News';
    // $labels->search_items = 'Search News';
    // $labels->not_found = 'No News found';
    // $labels->not_found_in_trash = 'No News found in Trash';
    // $labels->all_items = 'All News';
    // $labels->menu_name = 'News';
    // $labels->name_admin_bar = 'News';
}

<form method="get" action="" onsubmit="return checkForm();">
    <input type="text" placeholder="搜索" name="s" value="<?php the_search_query(); ?>">
    <button type="submit">
        <i class="iconfont icon-sousuo"></i>
    </button>
</form>

<div class="met-news-list" m-id="noset">
    <ul class="ulstyle met-pager-ajax imagesize" data-scale="400x400">
        <?php
        $paged = 1;
        if (get_query_var('page')) {
            $paged = get_query_var('page');
        }
        $s = get_search_query();
        $args = array(
            's' => $s,
            'paged' => $paged,
            'posts_per_page' => 20
        );

        // The Query
        $the_query = new WP_Query($args);
        if ($the_query->have_posts()) {
            while ($the_query->have_posts()) {
                $the_query->the_post();
        ?>
                <li>
                    <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
                </li>

                <li class="media media-lg border-bottom1">
                    <div class="media-left">
                        <a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>">
                            <img class="media-object" src="<?php echo catch_that_image(); ?>" alt="<?php the_title(); ?>" height="100" />
                        </a>
                    </div>
                    <div class="media-body">
                        <h4> <a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>" target="_self"><?php the_title(); ?></a> </h4>
                    </div>
                </li>

            <?php
            }
        } else {
            ?>
            <!--未找到任何搜索结果-->

        <?php }
        ?>
    </ul>
    <div class="m-t-20 text-xs-center hidden-sm-down" m-type="nosysdata">
        共<strong><?php echo $the_query->max_num_pages; ?></strong>页 <strong><?php echo $wp_query->found_posts; ?></strong>条
    </div>
    <?php bootstrap_pagination($the_query); ?>
</div>

<?php
// 获取文章第一张图片

function catch_that_image() {
    global $post, $posts;
    $first_img = '';
    ob_start();
    ob_end_clean();
    $output = preg_match_all('/<img.+?src=[\'"]([^\'"]+)[\'"].*?>/i', $post->post_content, $matches);
    $first_img = $matches[1][0];
    if (empty($first_img)) {
        $first_img = "/path/to/default.png";
    }
    return $first_img;
}

<?php
// 获取文章第一张图片
function catch_that_image() {
    global $post, $posts;
    $first_img = '';
    ob_start();
    ob_end_clean();
    $output = preg_match_all('/<img.+?src=[\'"]([^\'"]+)[\'"].*?>/i', $post->post_content, $matches);
    if ($output) {
        $first_img = $matches[1][0];
    }

    if (empty($first_img)) {
        $first_img = bloginfo('template_url') . "/assets/images/default_image.jpeg";
    }
    return $first_img;
}

$big = 999999999;
'base' => str_replace( $big, '%#%', esc_url( get_pagenum_link( $big ) ) ),

global $wp_query;
echo paginate_links( array(
     'base' => '%_%',
     'format' => '?page=%#%',
     'current' => max( 1, get_query_var('page') ),
     'total' => $wp_query->max_num_pages
 ) );

// 兼容bootstrap4的分页
function bootstrap_pagination(\WP_Query $wp_query = null, $echo = true) {
    if (null === $wp_query) {
        global $wp_query;
    }

    $pages = paginate_links(
        [
            //'base'         => str_replace( 999999999, '%#%', esc_url( get_pagenum_link( 999999999 ) ) ),
            'format'       => '?page=%#%',
            'current'      => max(1, get_query_var('paged')),
            'total'        => $wp_query->max_num_pages,
            'type'         => 'array',
            'show_all'     => false,
            'end_size'     => 3,
            'mid_size'     => 1,
            'prev_next'    => true,
            'prev_text'    => __('« 上一页'),
            'next_text'    => __('下一页 »'),
            'add_args'     => false,
            'add_fragment' => ''
        ]
    );

    if (is_array($pages)) {
        //$paged = ( get_query_var( 'paged' ) == 0 ) ? 1 : get_query_var( 'paged' );
        $pagination = '<div class="pagination"><ul class="pagination">';
        foreach ($pages as $page) {
            $pagination .= '<li class="page-item' . (strpos($page, 'current') !== false ? ' active' : '') . '"> ' . str_replace('page-numbers', 'page-link', $page) . '</li>';
        }
        $pagination .= '</ul></div>';
        if ($echo) {
            echo $pagination;
        } else {
            return $pagination;
        }
    }
    return null;
}

add_action('init', 'my_custom_post_product');
function my_custom_post_product() {
    $labels = array(
        'name'               => _x('产品中心', 'post type 名称'),
        'singular_name'      => _x('产品', 'post type 单个 item 时的名称，因为英文有复数'),
        'add_new'            => _x('添加产品', '添加新内容的链接名称'),
        'add_new_item'       => __('添加新产品'),
        'edit_item'          => __('编辑产品'),
        'new_item'           => __('新产品'),
        'all_items'          => __('产品列表'),
        'view_item'          => __('查看产品'),
        'search_items'       => __('搜索产品'),
        'not_found'          => __('没有找到有关产品'),
        'not_found_in_trash' => __('回收站里面没有相关产品'),
        'parent_item_colon'  => '',
        'menu_name'          => '产品管理'
    );

    $args = array(
        'labels'        => $labels,
        'description'   => '我们网站的产品信息',
        'public'        => true,
        'menu_position' => 5,
        'menu_icon'     => 'dashicons-money-alt',
        // 支持的功能，还可以添加：'excerpt', ,  'comments'
        'supports'      => array('title', 'editor', 'thumbnail'),
        /*这个设置为true，
        才能在前台 single-[post_type].php 和 archive-[post_type].php 显示列表*/
        'has_archive'   => true

    );
    // 注册文章类型，第一个参数为类型名称，即post type name
    register_post_type('product', $args);
}

为新注册的类型，添加分类功能，代码如下：

/**
 * 为产品 post type 添加分类功能
 */
add_action('init', 'my_taxonomies_product', 0);
function my_taxonomies_product() {
    $labels = array(
        'name'              => _x('产品分类', 'taxonomy 名称'),
        'singular_name'     => _x('产品分类', 'taxonomy 单数名称'),
        'search_items'      => __('搜索产品分类'),
        'all_items'         => __('所有产品分类'),
        'parent_item'       => __('该产品分类的上级分类'),
        'parent_item_colon' => __('该产品分类的上级分类：'),
        'edit_item'         => __('编辑产品分类'),
        'update_item'       => __('更新产品分类'),
        'add_new_item'      => __('添加新的产品分类'),
        'new_item_name'     => __('新产品分类'),
        'menu_name'         => __('产品分类'),
    );

    $args = array(
        'labels' => $labels,
        'hierarchical' => true,
    );
    /** 注册分类，第一个参数为分类法的名字，即taxonomy
    第二个参数为该分类属于哪个文章类型 */
    register_taxonomy('product_category', 'product', $args);
}


为新注册的文章类型添加额外的输入框，即 meta box

/**
 * 为产品发布类型 添加自定义 Meta Box
 * 功能特征 meta box
 */
add_action('add_meta_boxes', 'product_gongneng');
function product_gongneng() {
    // add_meta_box( $id, $title, $callback, $post_type, $context,$priority, $callback_args );
    add_meta_box(
        'product_gongneng',                 // id
        '功能特征',                          // title        
        'product_gongneng_meta_box',        // callback
        'product',                          // post_type
        'normal',                           // context
        'low'                               // priority
    );
}

/**
 * 为meta box 添加html表单
 */
function product_gongneng_meta_box($post) {
    // 创建临时隐藏表单，为了安全
    wp_nonce_field('product_gongneng_meta_box', 'product_gongneng_meta_box_nonce');

    // 获取之前存储的值
    $field_value = get_post_meta($post->ID, '_product_gongneng', false);
?>
    <p>
        <label for="_product_gongneng"></label>
        <?php
        $settings = array(
            'quicktags' => array('buttons' => 'em,strong,link',),
            'quicktags' => true,
            'tinymce' => true,
            'editor_height' => 100, // In pixels, takes precedence and has no default value
            'textarea_rows' => 20,  // Has no visible effect if editor_height is set, default is 20
        );

        wp_editor(html_entity_decode($field_value[0]), '_product_gongneng', $settings);
        ?>
    </p>
<?php

}


// 保存meta_box
add_action('save_post', 'product_gongneng_save_meta_box');
function product_gongneng_save_meta_box($post_id) {
    // 安全检查
    // 检查是否发送了一次性隐藏表单内容（判断是否为第三者模拟提交）
    if (!isset($_POST['product_gongneng_meta_box_nonce'])) {
        echo 'a11111';
        exit();
        return;
    }

    // 判断隐藏表单的值与之前是否相同
    if (!wp_verify_nonce($_POST['product_gongneng_meta_box_nonce'], 'product_gongneng_meta_box')) {
        echo '222';
        exit();
        return;
    }

    // 判断该用户是否有权限
    if (!current_user_can('edit_post', $post_id)) {
        echo '333';
        exit();
        return;
    }


    // 判断 Meta Box 是否为空
    if (!isset($_POST['_product_gongneng'])) {
        echo '444';
        exit();
        return;
    }

    // 使用 wpautop 函数，是因为表单中 使用了富文本编辑器，要对文本进行处理
    $gongeng = htmlentities(wpautop($_POST['_product_gongneng']));
    $_product_gongneng = sanitize_text_field($gongeng);
    // 把字段值保存到数据库
    update_post_meta($post_id, '_product_gongneng', $_product_gongneng);
}