functions.php

<?php
/**
 * MDx 主题主函数文件
 *
 * 已适配 WordPress 6.4 ~ 7.1 与 PHP 7.4 ~ 8.3。
 * 说明：本文件在 WordPress 的 init 动作之前执行，因此这里不能直接调用
 * 需要 init 之后才可用的翻译函数（__() 等），否则 WordPress 6.7+ 会
 * 报 "_load_textdomain_just_in_time was called incorrectly"。
 * 解决办法是在文件最顶部显式载入主题翻译。
 */
if (function_exists('load_theme_textdomain')) {
    load_theme_textdomain('mdx', get_template_directory() . '/languages');
}

$mdx_all_options = get_option('mdx_all_options');
if (!is_array($mdx_all_options)) {
    // 全新安装或数据损坏时 get_option() 可能返回 false，
    // PHP 8.1+ 不允许再把 false 当作数组自动创建键（deprecated）。
    $mdx_all_options = array();
}

// 首次安装 / 首次激活时一次性写入全部默认值（单次写入，避免并发请求互相覆盖）。
if (empty($mdx_all_options) || !get_option('mdx_first_init')) {
    require __DIR__ . '/includes/default_value.php';
    $mdx_install_flag = 'normal';
    if (stripos(explode('//', home_url())[1], '/')) {
        $mdx_install_flag = 'sub';
    }
    $mdx_default_values['mdx_install'] = $mdx_install_flag;
    $mdx_all_options = array_merge($mdx_default_values, $mdx_all_options);
    update_option('mdx_all_options', $mdx_all_options);
    update_option('mdx_first_init', '1');
}
$GLOBALS['mdx_all_options'] = $mdx_all_options;

/**
 * 更新一个主题选项。
 *
 * 注意：必须与数据库中已有的选项合并后再写入，否则当 $GLOBALS['mdx_all_options']
 * 只包含当前请求读取过的少量选项时，会把后台保存的其它选项整体覆盖掉。
 */
function mdx_update_option($option_name, $option_value) {
    $all_options = get_option('mdx_all_options');
    if (!is_array($all_options)) {
        $all_options = array();
    }
    if (isset($GLOBALS['mdx_all_options']) && is_array($GLOBALS['mdx_all_options'])) {
        $all_options = array_merge($all_options, $GLOBALS['mdx_all_options']);
    }
    $all_options[$option_name] = $option_value;
    $GLOBALS['mdx_all_options'] = $all_options;
    update_option('mdx_all_options', $all_options);
    return true;
}

function mdx_get_option($option_name) {
    if (isset($GLOBALS['mdx_all_options'][$option_name])) {
        return $GLOBALS['mdx_all_options'][$option_name];
    }

    require __DIR__ . '/includes/default_value.php';
    if (isset($mdx_default_values[$option_name])) {
        mdx_update_option($option_name, $mdx_default_values[$option_name]);
        return $mdx_default_values[$option_name];
    }

    return false;
}

$mdx_now_url = '';
$mdx_flag_subdir = false;
if (stripos(explode('//', home_url())[1], '/') || mdx_get_option('mdx_install') === 'sub') {
    $mdx_flag_subdir = true;
}

// 此处修正原因：当到达下边的else if时，$mdx_flag_subdir 必定为true，因为!$mdx_flag_subdir 已经为false
if (!$mdx_flag_subdir) {
    global $wp;
    $mdx_now_url = home_url(add_query_arg(array()));
} else if (get_option('permalink_structure') === '') {
    global $wp;
    $mdx_now_url = add_query_arg($wp->query_string, '', home_url($wp->request));
} else if (get_option('permalink_structure') !== '') {
    global $wp;
    $current_url = home_url(add_query_arg(array(), $wp->request));
} else {
    global $wp;
    $mdx_now_url = home_url(add_query_arg(array()));
}
function mdx_get_now_url($is_post = false, $post_id = 0) {
    if ($is_post) {
        return get_permalink($post_id);
    }
    return htmlspecialchars($GLOBALS['mdx_now_url']);
}

//激活功能
// 主题基础支持（经典主题在 WordPress 6.x / 7.x 中所需的常规声明）
add_theme_support('post-thumbnails');
add_theme_support('post-formats', array('image', 'link', 'status', 'video', 'audio'));
add_theme_support('html5', array('search-form', 'comment-form', 'comment-list', 'gallery', 'caption', 'style', 'script'));
add_theme_support('automatic-feed-links');
add_theme_support('responsive-embeds');

remove_filter('the_title', 'wptexturize');
remove_filter('wp_title', 'wptexturize');
remove_filter('single_post_title', 'wptexturize');

/**
 * 注册导航菜单与侧边栏。
 *
 * 说明：这些注册项包含需要翻译的字符串，必须放在 after_setup_theme 中执行，
 * 否则 WordPress 6.7+ 会报 "_load_textdomain_just_in_time ... triggered too early"。
 */
function mdx_register_theme_menus() {
    register_nav_menus(array('mdx_menu' => __('抽屉菜单', 'mdx')));
    register_sidebar(
        array(
            'name' => __('右侧菜单', 'mdx'),
            'id' => 'widget_right',
            'description' => __('在每个页面的右侧，默认隐藏，可以通过滑动或按钮调出。', 'mdx'),
            'before_widget' => '<div class="mdui-card mdx-widget %2$s">',
            'after_widget' => '</div></div>',
            'before_title' => '<div class="mdui-card-primary"><div class="mdui-card-primary-title">',
            'after_title' => '</div></div><div class="mdui-card-content mdui-typo">'
        )
    );
}
add_action('after_setup_theme', 'mdx_register_theme_menus');

if (mdx_get_option('mdx_title_med') == "wp") {
    add_theme_support('title-tag');
}

// 说明：默认选项已在文件顶部一次性初始化，不再向任何第三方服务器发送请求。

include_once __DIR__ . '/includes/admin_init_ver.php';

// 增强选项与兼容层（阅读时长、版权协议、自定义 CSS、登录页美化等）
require_once __DIR__ . '/includes/mdx-extra.php';

//后台菜单添加
if (is_admin()) {
    include_once __DIR__ . '/admin_functions.php';
}

// 说明：已移除主题自带的 Plugin Update Checker。
// 原因：1) 上游更新接口已停止维护；2) 本主题为定制版本，自动更新会覆盖本地修改。
// 如需恢复，请重新安装 plugin-update-checker 并在下方自行调用 Puc_v4_Factory。

//自定义菜单样式
function mdx_menu_classes($classes, $item, $args)//求问这个$item的作用是什么？
{
    if ($args->theme_location == 'mdx_menu') {
        $classes[] = 'mdui-list-item mdui-ripple';
    }
    return $classes;
}
add_filter('nav_menu_css_class', 'mdx_menu_classes', 1, 3);

//激活链接功能
add_filter('pre_option_link_manager_enabled', '__return_true');

include('includes/cdn_version.php');
$files_root = '';
if (mdx_get_option("mdx_use_cdn") === "custom") {
    $files_root = mdx_get_option("mdx_custom_cdn_root");
} else if (mdx_get_option("mdx_use_cdn") === "jsdelivr") {
    $files_root = 'https://cdn.jsdelivr.net/gh/yrccondor/mdx@'.$cdn_commit_version;
} else {
    $files_root = get_template_directory_uri();
}

//载入css & js
function mdx_css() {
    global $files_root;
    wp_register_style('mdx_mdui_css', $files_root.'/mdui/css/mdui.min.css', '', '');
    // style.css 包含本版本的定制样式，始终从本地主题目录加载（不受 CDN 选项影响）
    wp_register_style('mdx_style_css', get_template_directory_uri().'/style.css', '', '');
    wp_enqueue_style('mdx_mdui_css');
    wp_enqueue_style('mdx_style_css');
    if (mdx_get_option('mdx_styles_dark') === "oled" || mdx_get_option('mdx_night_style') === "oled") {
        wp_register_style('mdx_oled', $files_root.'/css/oled.css', '', '');
        wp_enqueue_style('mdx_oled');
    }
    if (mdx_get_option("mdx_md2") == "true" && !mdx_option_true('mdx_md3')) {
        wp_register_style('mdx_md2', $files_root.'/css/md2.css', '', '');
        wp_enqueue_style('mdx_md2');
    }
    // MD3（Material Design 3）外观层：设计令牌 + 组件样式
    if (mdx_option_true('mdx_md3')) {
        wp_register_style('mdx_md3_tokens', get_template_directory_uri().'/css/md3-tokens.css', array('mdx_style_css'), get_option('mdx_version_commit'));
        wp_register_style('mdx_md3_css', get_template_directory_uri().'/css/md3.css', array('mdx_md3_tokens'), get_option('mdx_version_commit'));
        wp_enqueue_style('mdx_md3_tokens');
        wp_enqueue_style('mdx_md3_css');
    }
    if (is_home() && mdx_get_option('mdx_index_head_style') === 'slide') {
        wp_register_style('mdx_flickity_css', $files_root.'/css/flickity.min.css', '', '');
        wp_enqueue_style('mdx_flickity_css');
    }
}
add_action('wp_enqueue_scripts', 'mdx_css');

function mdx_css_login() {
    global $files_root;
    if (mdx_get_option("mdx_login_md") == "true") {
        wp_register_style('mdx_mdui_css_login', $files_root.'/mdui/css/mdui.min.css', '', '');
        wp_register_style('mdx_style_css_login', $files_root.'/css/login.css', '', '');
        wp_enqueue_style('mdx_mdui_css_login');
        wp_enqueue_style('mdx_style_css_login');
        if (mdx_get_option("mdx_md2") == "true" && !mdx_option_true('mdx_md3')) {
            wp_register_style('mdx_md2_login', $files_root.'/css/md2.css', '', '');
            wp_enqueue_style('mdx_md2_login');
        }
    }
}

if (mdx_get_option("mdx_login_md") === "true") {
    add_action('login_enqueue_scripts', 'mdx_css_login');
}


function mdx_js() {
    global $files_root;
    if (mdx_get_option("mdx_jquery") === "true") {
        wp_register_script('mdx_jquery', $files_root.'/js/jquery.min.js', false, '', true);
        wp_enqueue_script('mdx_jquery');
    }
    wp_register_script('mdx_mdui_js', $files_root.'/mdui/js/mdui.min.js', false, '', true);
    wp_register_script('mdx_common', $files_root.'/js/common.js', false, '', true);
    wp_register_script('mdx_sl_js', $files_root.'/js/lazyload.js', false, '', true);
    wp_enqueue_script('mdx_mdui_js');
    wp_enqueue_script('mdx_common');
    if (mdx_get_option("mdx_real_search") == "true") {
        wp_register_script('mdx_rs_js', $files_root.'/js/search.js', false, '', true);
        wp_enqueue_script('mdx_rs_js');
    }
    if (is_single() || is_page()) {
        wp_register_script('mdx_qr_js', $files_root.'/js/qr.js', false, '', true);
        wp_enqueue_script('mdx_qr_js');
        if (mdx_get_option("mdx_toc") == "true" && is_single()) {
            wp_register_script('mdx_toc_js', $files_root.'/js/toc.js', false, '', true);
            wp_enqueue_script('mdx_toc_js');
            wp_localize_script('mdx_toc_js', 'mdx_show_preview', array("preview" => mdx_get_option("mdx_toc_preview")));
        }
        if (mdx_get_option("mdx_read_pro") === "true") {
            wp_register_script('mdx_ra_js', $files_root.'/js/ra.js', false, '', true);
            wp_enqueue_script('mdx_ra_js');
        }
    }
    if (is_singular() && comments_open() && get_option('thread_comments')) {
        wp_enqueue_script('better-comment', $files_root.'/js/better_comment.js', array(), AC_VERSION, true);
        wp_enqueue_script('ajax-comment', $files_root.'/ajax-comment/app.js', array(), AC_VERSION, true);
        wp_localize_script('ajax-comment', 'ajaxcomment', array(
            'ajax_url' => admin_url('admin-ajax.php'),
            'order' => get_option('comment_order'),
            'formpostion' => 'top',
            'i18n_1' => __('发送成功。', 'mdx'),
            'i18n_2' => __('<strong>错误：</strong> 未知错误。', 'mdx'),
        ));
    }
    if (is_home() && mdx_get_option('mdx_index_head_style') === 'slide') {
        wp_register_script('mdx_flickity_js', $files_root.'/js/flickity.min.js', false, '', true);
        wp_enqueue_script('mdx_flickity_js');
    }
    if ((!is_single() && !is_page() && !is_404()) && mdx_get_option('mdx_post_list_width') === 'wide') {
        wp_register_script('mdx_masonry_js', $files_root.'/js/masonry.min.js', false, '', true);
        wp_enqueue_script('mdx_masonry_js');
    }
    wp_enqueue_script('mdx_sl_js');
}
add_action('wp_enqueue_scripts', 'mdx_js');

function mdx_js_login() {
    global $files_root;
    if (mdx_get_option("mdx_login_md") == "true") {
        wp_register_script('mdx_mdui_js_login', $files_root.'/mdui/js/mdui.min.js', false, '', true);
        wp_register_script('mdx_js_login', $files_root.'/js/login.js', false, '', true);
        wp_enqueue_script('mdx_mdui_js_login');
        wp_enqueue_script('mdx_js_login');
    }
}

if (mdx_get_option("mdx_login_md") == "true") {
    add_action('login_enqueue_scripts', 'mdx_js_login');
}

// 添加古腾堡资源
function mdx_load_blocks() {
    wp_enqueue_script(
        'mdx_block_js',
        get_template_directory_uri().'/blocks/blocks.build.js',
        ['wp-blocks', 'wp-i18n', 'wp-element', 'wp-editor'],
        true
    );
    wp_set_script_translations('mdx_block_js', 'mdx', get_template_directory().'/blocks/languages/');
}
add_action('enqueue_block_editor_assets', 'mdx_load_blocks');

function mdx_get_post_default_url() {
    return mdx_get_option('mdx_post_def_img_url') ? mdx_get_option('mdx_post_def_img_url') : get_template_directory_uri().'/img/dpic.jpg';
}

//Ajax评论
require('ajax-comment/main.php');

//页面浏览量
function get_post_views($post_id) {
    $count_key = 'views';
    $count = get_post_meta($post_id, $count_key, true);
    if ($count == '') {
        delete_post_meta($post_id, $count_key);
        add_post_meta($post_id, $count_key, '0');
        $count = '0';
    }
    echo number_format_i18n($count);
}

function set_post_views() {
    global $post;
    if (!$post) {
        return;
    }
    $post_id = $post->ID;
    $count_key = 'views';
    $count = get_post_meta($post_id, $count_key, true);
    if (is_single() || is_page()) {
        if ($count == '') {
            delete_post_meta($post_id, $count_key);
            add_post_meta($post_id, $count_key, '0');
        } else {
            update_post_meta($post_id, $count_key, $count + 1);
        }
    }
}
add_action('get_header', 'set_post_views');

// 同时删除head和feed中的WP版本号
function mdx_remove_wp_version() {
    return '';
}
add_filter('the_generator', 'mdx_remove_wp_version');

// 隐藏js/css附加的WP版本号
function mdx_remove_wp_version_strings($src) {
    global $wp_version;
    $query_string = parse_url($src, PHP_URL_QUERY);
    parse_str((string)$query_string, $query);
    if (!empty($query['ver'])) {
        if ($query['ver'] === $wp_version) {
            $src = str_replace($query_string, str_replace('ver='.$wp_version, 'ver='.get_option('mdx_version_commit'), $query_string), $src);
        }
    } else {
        $src = add_query_arg('ver', get_option('mdx_version_commit'), $src);
    }
    return $src;
}
add_filter('script_loader_src', 'mdx_remove_wp_version_strings');
add_filter('style_loader_src', 'mdx_remove_wp_version_strings');

//搜索结果排除页面
function mdx_search_filter_page($query) {
    if ($query->is_search) {
        $query->set('post_type', 'post');
    }
    return $query;
}
add_filter('pre_get_posts', 'mdx_search_filter_page');

//评论回调
function mdx_comment_format($comment, $args, $depth) {
    $GLOBALS['comment'] = $comment; ?>
    <li class="mdui-list-item" id="li-comment-<?php comment_ID(); ?>">
        <div class="mdui-list-item-avatar"><?php if (function_exists('get_avatar') && get_option('show_avatars')) {
                                                echo get_avatar($comment, 80);
                                            } ?></div>
        <div class="mdui-list-item-content outbu" id="comment-<?php comment_ID(); ?>">
            <div
                class="mdui-list-item-title"><?php echo get_comment_author_link(); ?><?php if (user_can($comment->user_id, "update_core")) {
                    echo '<span class="mdx-admin">'.__('博主', 'mdx').'</span>';
                                                                                        } ?></div>
            <div class="mdui-list-item-text mdui-typo">
                <?php comment_text(); ?>
            </div>
            <span
                class="mdx-reply-time"><?php echo human_time_diff(get_comment_time('U'), current_time('timestamp')).__('前', 'mdx'); ?></span><?php comment_reply_link(array_merge($args, array('reply_text' => '<i class="mdui-icon material-icons">&#xe15e;</i> '.__('回复', 'mdx'), 'depth' => $depth, 'max_depth' => $args['max_depth']))) ?>
        </div>
    </li>
    <li class="mdui-divider-inset mdui-m-y-0"></li>
<?php }

//回复的评论加@
function comment_add_at($comment_text, $comment) {
    // WordPress 7.x 中 comment_text 过滤器可能在不传评论对象（或传入 null）时被调用，
    // 这里增加类型判断，避免 "Attempt to read property on null" 警告。
    if (!($comment instanceof WP_Comment) || (int) $comment->comment_parent <= 0) {
        return $comment_text;
    }
    $comment_text = '<a rel="nofollow" class="comment_at" href="#comment-'.$comment->comment_parent.'">@'.get_comment_author($comment->comment_parent).'：</a> '.$comment_text;
    return $comment_text;
}
add_filter('comment_text', 'comment_add_at', 10, 2);

//获取链接
function get_link_items() {
    $linkcats = get_terms('link_category');
    if (!empty($linkcats)) {
        $result = '';
        foreach ($linkcats as $linkcat) {
            $result .= '<h3 class="link-title">'.$linkcat->name.'</h3>';
            if ($linkcat->description) $result .= '<div class="link-description">'.$linkcat->description.'</div>';
            $result .= get_the_link_items($linkcat->term_id);
        }
    } else {
        $result = get_the_link_items();
    }
    return $result;
}

// 将在 图像链接 > 备注中的图像 url > 备注中的 Gravatar 邮箱(需设置中开启)中获取链接图像
function get_the_link_items($id = null) {
    $mdx_v_friendly_links_style = mdx_get_option('mdx_friendly_links_style');
    $mdx_gravatar_actived = mdx_get_option('mdx_gravatar_actived');
    $mdx_link_rand_order = mdx_get_option('mdx_link_rand_order');
    $order_rule = '';
    if ($id !== null) {
        $order_rule = 'category='.$id;
    }
    if ($mdx_link_rand_order == 'true') {
        $order_rule .= $order_rule === '' ? 'orderby=rand' : '&orderby=rand';
    }
    $bookmarks = get_bookmarks($order_rule);
    $output = '';
    if (!empty($bookmarks)) {
        $output .= '<div class="mdui-container">';
        foreach ($bookmarks as $bookmark) {
            if (!empty($bookmark->link_image)) {
                $lazy_load = ' lazyload" data-bg="'.$bookmark->link_image;
            } else {
                $imglink = $bookmark->link_notes;
                if (substr($imglink, 0, 4) !== 'http' && $mdx_gravatar_actived == 'true') {
                    $imglink = get_avatar_url($imglink, array('size' => 512));
                }
                $lazy_load = ' lazyload" data-bg="'.$imglink;
            }
            $rel = '';
            if (!empty($bookmark->link_rel)) {
                $rel = 'rel="'.$bookmark->link_rel.'" ';
            }
            if ($mdx_v_friendly_links_style == '0') {
                $output .= '<div class="mdui-row mdui-col-xs-6 mdui-col-sm-4 links-co-grid"><div class="links-c-grid mdui-color-theme"></div><a '.$rel.'href="'.$bookmark->link_url.'" title="'.$bookmark->link_name.'" target="'.$bookmark->link_target.'"><div class="mdx-links-bg-grid '.$lazy_load.'"></div></a><div class="mdui-grid-tile-actions links-des-grid"><div class="mdui-grid-tile-text"><div class="mdui-grid-tile-title links-name-grid"><a '.$rel.'href="'.$bookmark->link_url.'" title="'.$bookmark->link_name.'" target="'.$bookmark->link_target.'">'.$bookmark->link_name.'</a></div><div class="mdui-grid-tile-subtitle">'.$bookmark->link_description.'</div></div></div></div>';
            } elseif ($mdx_v_friendly_links_style == '1') {
                if ($bookmark->link_rss != null) {
                    $rss_html = '
                    <button class="mdui-btn mdui-ripple">
                      <a '.$rel.'href="'.$bookmark->link_rss.'" title="'.$bookmark->link_name.'" target="'.$bookmark->link_target.'">RSS</a>
                    </button>
                    ';
                } else {
                    $rss_html = '';
                }
                $output .= '
                <div class="mdui-row mdui-col-xs-6 mdui-col-sm-4 mdui-card">
                  <div class="mdui-card-header">
                    <div class="mdui-card-header-avatar mdx-links-avatar-card '.$lazy_load.'"></div>
                    <div class="mdui-card-header-title">'.$bookmark->link_name.'</div>
                    <div class="mdui-card-header-subtitle">'.$bookmark->link_description.'</div>
                  </div>
                  <div class="mdui-card-content">'.$bookmark->link_notes.'</div>
                  <div class="mdui-card-actions">
                    <button class="mdui-btn mdui-ripple">
                      <a '.$rel.'href="'.$bookmark->link_url.'" title="'.$bookmark->link_name.'" target="'.$bookmark->link_target.'">前往</a>
                    </button>
                    '.$rss_html.'
                  </div>
                </div>';
            }
        }
        $output .= '</div>';
    }
    return $output;
}

function mdx_blogroll_nofollow() {
    add_action('add_meta_boxes', 'mdx_blogroll_add_meta_box', 1, 1);
    add_filter('pre_link_rel', 'mdx_blogroll_save_meta_box', 10, 1);
}

function mdx_blogroll_add_meta_box() {
    add_meta_box('mdx_blogroll_nofollow_div', __('nofollow'), 'mdx_blogroll_inner_meta_box', 'link', 'side');
}

function mdx_blogroll_inner_meta_box($post) {
    $bookmark = get_bookmark($post->ID, 'ARRAY_A');
    if (strpos($bookmark['link_rel'], 'nofollow') !== FALSE)
        $checked = ' checked="checked"';
    else
        $checked = '';
?>
    <input value="1" id="mdx_blogroll_nofollow_checkbox" name="mdx_blogroll_nofollow_checkbox"
           type="checkbox"<?php echo $checked; ?>> <label
    for="mdx_blogroll_nofollow_checkbox"><?php echo __('添加 <code>nofollow</code> 属性', 'mdx'); ?></label>
<?php
}

function mdx_blogroll_save_meta_box($link_rel) {
    $rel = trim(str_replace('nofollow', '', (string) $link_rel));
    if (!empty($_POST['mdx_blogroll_nofollow_checkbox'])) {
        $rel .= ' nofollow';
    }
    return trim($rel);
}
add_action('load-link.php', 'mdx_blogroll_nofollow');
add_action('load-link-add.php', 'mdx_blogroll_nofollow');

//获取摘要
function mdx_get_post_excerpt($post, $excerpt_length = 150) {
    if (!$post) $post = get_post();
    if (!$post) return '';

    // 新增选项：统一指定摘要字数（0 表示沿用各布局的预设值）
    $mdx_custom_excerpt_length = (int) mdx_get_option('mdx_excerpt_length');
    if ($mdx_custom_excerpt_length > 0) {
        $excerpt_length = $mdx_custom_excerpt_length;
    }

    $post_excerpt = $post->post_excerpt;
    if ($post_excerpt == '') {
        $post_content = $post->post_content;
        $post_content = do_shortcode($post_content);
        $post_content = wp_strip_all_tags($post_content);

        if (function_exists('mb_strimwidth')) {
            $post_excerpt = mb_strimwidth($post_content, 0, $excerpt_length, '…', 'utf-8');
        } else {
            // mbstring 未启用时的兼容回退
            $post_excerpt = wp_html_excerpt($post_content, $excerpt_length, '…');
        }
    }

    $post_excerpt = wp_strip_all_tags($post_excerpt);
    return trim(preg_replace("/[\n\r\t ]+/", ' ', $post_excerpt), ' ');
}

//PostLazyLoad
function mdx_lazyload_image($content) {
    if (is_feed()) {
        return $content;
    }
    return preg_replace_callback('#<(img)([^>]+?)(>(.*?)</\\1>|[/]?>)#si', 'mdx_process_image', $content);
}

/**
 * 安全读取 wp_kses_hair() 解析出的图片属性值。
 *
 * @param array  $img   属性数组。
 * @param string $name  属性名。
 * @return string 属性值，不存在时返回空字符串。
 */
function mdx_get_img_attr_value($img, $name) {
    return isset($img[$name]['value']) ? $img[$name]['value'] : '';
}

function mdx_process_image($matches) {
    $placeholder_image = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
    $old_attributes_str = isset($matches[2]) ? $matches[2] : '';
    $img = wp_kses_hair($old_attributes_str, wp_allowed_protocols());
    $src = mdx_get_img_attr_value($img, 'src');
    if ($src === '') {
        return $matches[0];
    }
    $mdx_sizes = mdx_get_img_attr_value($img, 'sizes');
    $mdx_sizes = $mdx_sizes !== '' ? ' sizes="'.$mdx_sizes.'"' : '';
    $mdx_srcset = mdx_get_img_attr_value($img, 'srcset');
    $mdx_srcset = $mdx_srcset !== '' ? ' data-srcset="'.$mdx_srcset.'"' : '';
    $mdx_img_style = mdx_get_img_attr_value($img, 'style');
    $mdx_img_style = $mdx_img_style !== '' ? ' style="'.$mdx_img_style.'"' : '';
    $mdx_img_width = mdx_get_img_attr_value($img, 'width');
    $mdx_img_width = $mdx_img_width !== '' ? ' width="'.$mdx_img_width.'"' : '';
    $mdx_figure_width = mdx_get_img_attr_value($img, 'width');
    $mdx_figure_width = $mdx_figure_width !== '' ? 'max-width:'.$mdx_figure_width.'px' : '';
    $mdx_img_height = mdx_get_img_attr_value($img, 'height');
    $mdx_img_height = $mdx_img_height !== '' ? ' height="'.$mdx_img_height.'"' : '';
    $mdx_con_paading = (mdx_get_img_attr_value($img, 'height') !== '' && mdx_get_img_attr_value($img, 'width') !== '' && (float) mdx_get_img_attr_value($img, 'width') > 0) ? mdx_get_img_attr_value($img, 'height') / mdx_get_img_attr_value($img, 'width') * 100 : 50;
    $mdx_img_class = mdx_get_img_attr_value($img, 'class');
    $mdx_img_class = $mdx_img_class !== '' ? $mdx_img_class.' ' : '';
    $mdx_img_alt = mdx_get_img_attr_value($img, 'alt');
    $mdx_img_title = ' title="'.($mdx_img_alt !== '' ? $mdx_img_alt : get_the_title()).'"';
    $mdx_img_alt = ' alt="'.($mdx_img_alt !== '' ? $mdx_img_alt : $src).'"';
    if ($mdx_img_class === "wp-smiley ") {
        return $matches[0];
    }
    if (mdx_get_option("mdx_lazyload_fallback") == "true") {
        $html = '<img'.$mdx_img_width.''.$mdx_img_height.' class="'.$mdx_img_class.'lazyload"'.$mdx_img_style.$mdx_img_title.' src="data:image/gif;base64,R0lGODlhAgABAIAAALGxsQAAACH5BAAAAAAALAAAAAACAAEAAAICBAoAOw==" data-src="'.$src.'"'.$mdx_img_alt.$mdx_srcset.''.$mdx_sizes.'>';
    } else {
        $html = '<figure class="mdx-lazyload-container" style="'.$mdx_figure_width.'"><div style="padding-top:'.strval($mdx_con_paading).'%"></div><div class="mdx-img-loading-sp mdui-valign"><div><div class="mdui-spinner"></div></div></div><img'.$mdx_img_width.''.$mdx_img_height.' class="'.$mdx_img_class.'lazyload"'.$mdx_img_style.$mdx_img_title.' src="'.$placeholder_image.'" data-src="'.$src.'"'.$mdx_img_alt.$mdx_srcset.''.$mdx_sizes.'></figure>';
    }
    return $html;
}

function mdx_lazyload_avatar($content) {
    if (is_feed()) {
        return $content;
    }
    return preg_replace_callback('#<(img)([^>]+?)(>(.*?)</\\1>|[/]?>)#si', 'mdx_process_avatar', $content);
}

function mdx_process_avatar($matches) {
    $placeholder_image = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
    $old_attributes_str = isset($matches[2]) ? $matches[2] : '';
    $img = wp_kses_hair($old_attributes_str, wp_allowed_protocols());
    $src = mdx_get_img_attr_value($img, 'src');
    if ($src === '') {
        return $matches[0];
    }
    $mdx_sizes = mdx_get_img_attr_value($img, 'sizes');
    $mdx_sizes = $mdx_sizes !== '' ? ' sizes="'.$mdx_sizes.'"' : '';
    $mdx_srcset = mdx_get_img_attr_value($img, 'srcset');
    $mdx_srcset = $mdx_srcset !== '' ? ' data-srcset="'.$mdx_srcset.'"' : '';
    $mdx_img_width = mdx_get_img_attr_value($img, 'width');
    $mdx_img_width = $mdx_img_width !== '' ? ' width="'.$mdx_img_width.'"' : '';
    $mdx_img_height = mdx_get_img_attr_value($img, 'height');
    $mdx_img_height = $mdx_img_height !== '' ? ' height="'.$mdx_img_height.'"' : '';
    $mdx_img_class = mdx_get_img_attr_value($img, 'class');
    $mdx_img_class = $mdx_img_class !== '' ? $mdx_img_class.' ' : '';
    $mdx_img_alt = mdx_get_img_attr_value($img, 'alt');
    $mdx_img_alt = $mdx_img_alt !== '' ? ' alt="'.$mdx_img_alt.'"' : '';
	return '<img'.$mdx_img_width.''.$mdx_img_height.' class="'.$mdx_img_class.'lazyload mdx-avatar-lazyload" src="'.$placeholder_image.'" data-src="'.$src.'"'.$mdx_img_alt.$mdx_srcset.''.$mdx_sizes.'>';
}

function filter_ptags_on_images($content) {
    return preg_replace('/<p>\s*(<a .*>)?\s*(<img .* \/>)\s*(<\/a>)?\s*<\/p>/iU', '\1\2\3', $content);
}

if (!is_admin() && mdx_get_option('mdx_lazy_load_mode') == 'speed') {
    add_filter('the_content', 'mdx_lazyload_image', 99);
    add_filter('the_content', 'filter_ptags_on_images', 98);
    add_filter('get_avatar', 'mdx_lazyload_avatar', 11);
}


//面包屑
function mdx_breadcrumbs() {
    $delimiter = '&nbsp;&nbsp;<span class="mdx-spr">•</span>&nbsp;&nbsp;'; // 分隔符
    $before = '<span class="current">'; // 在当前链接前插入
    $after = '</span>'; // 在当前链接后插入
    if (!is_home() && !is_front_page() || is_paged()) {
        echo '<div itemscope itemtype="https://schema.org/WebPage" id="crumbs">';
        global $post;
        $homeLink = home_url();
        echo ' <a itemprop="breadcrumb" href="'.$homeLink.'">'.__('首页', 'mdx').'</a> '.$delimiter.' ';
        if (is_category()) {
            global $wp_query;
            $cat_obj = $wp_query->get_queried_object();
            $thisCat = $cat_obj->term_id;
            $thisCat = get_category($thisCat);
            $parentCat = get_category($thisCat->parent);
            if ($thisCat->parent != 0) {
                $cat_code = get_category_parents($parentCat, TRUE, ' '.$delimiter.' ');
                echo str_replace('<a', '<a itemprop="breadcrumb"', $cat_code);
            }
            echo $before.''.single_cat_title('', false).''.$after;
        } elseif (is_day()) {
            echo '<a itemprop="breadcrumb" href="'.get_year_link(get_the_time('Y')).'">'.get_the_time('Y').'</a> '.$delimiter.' ';
            echo '<a itemprop="breadcrumb"  href="'.get_month_link(get_the_time('Y'), get_the_time('m')).'">'.get_the_time('F').'</a> '.$delimiter.' ';
            echo $before.get_the_time('d').$after;
        } elseif (is_month()) {
            echo '<a itemprop="breadcrumb" href="'.get_year_link(get_the_time('Y')).'">'.get_the_time('Y').'</a> '.$delimiter.' ';
            echo $before.get_the_time('F').$after;
        } elseif (is_year()) {
            echo $before.get_the_time('Y').$after;
        } elseif (is_single() && !is_attachment()) {
            if (get_post_type() != 'post') {
                $post_type = get_post_type_object(get_post_type());
                $slug = $post_type->rewrite;
                echo '<a itemprop="breadcrumb" href="'.$homeLink.'/'.$slug['slug'].'/">'.$post_type->labels->singular_name.'</a> '.$delimiter.' ';
            } else {
                $cat = get_the_category();
                $cat = $cat[0];
                $cat_code = get_category_parents($cat, TRUE, ' '.$delimiter.' ');
                echo str_replace('<a', '<a itemprop="breadcrumb"', $cat_code);
            }
	        echo $before.get_the_title().$after;
        } elseif (!is_single() && !is_page() && get_post_type() != 'post') {
            $post_type = get_post_type_object(get_post_type());
            echo $before.$post_type->labels->singular_name.$after;
        } elseif (is_attachment()) {
            $parent = get_post($post->post_parent);
            get_the_category($parent->ID);
	        echo '<a itemprop="breadcrumb" href="'.get_permalink($parent).'">'.$parent->post_title.'</a> '.$delimiter.' ';
            echo $before.get_the_title().$after;
        } elseif (is_page() && !$post->post_parent) {
            echo $before.get_the_title().$after;
        } elseif (is_page() && $post->post_parent) {
            $parent_id = $post->post_parent;
            $breadcrumbs = array();
            while ($parent_id) {
                $page = get_post($parent_id);
                $breadcrumbs[] = '<a itemprop="breadcrumb" href="'.get_permalink($page->ID).'">'.get_the_title($page->ID).'</a>';
                $parent_id = $page->post_parent;
            }
            $breadcrumbs = array_reverse($breadcrumbs);
            foreach ($breadcrumbs as $crumb) echo $crumb.' '.$delimiter.' ';
            echo $before.get_the_title().$after;
        } elseif (is_search()) {
            echo $before;
            printf(__('搜索结果： %s', 'mdx'), get_search_query());
            echo $after;
        } elseif (is_tag()) {
            echo $before;
            printf(__('标签存档 %s', 'mdx'), single_tag_title('', false));
            echo $after;
        } elseif (is_author()) {
            global $author;
            $userdata = get_userdata($author);
            echo $before;
            printf(__('作者存档 %s', 'mdx'), $userdata->display_name);
            echo $after;
        } elseif (is_404()) {
            echo $before;
            _e('什么也没找到', 'mdx');
            echo $after;
        }
        if (get_query_var('paged')) {
            if (is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author())
                echo sprintf(__('( 第 %s 页 )', 'mdx'), get_query_var('paged'));
        }
    }
}

//shortcodes & buttons
function mdx_shortcode_hide($atts, $content = null) {
    extract(shortcode_atts(array("title" => __('被折叠内容', 'mdx'), 'open' => 'false'), $atts));
    $mdx_open = '';
    if ($open == 'true') {
        $mdx_open = ' mdui-panel-item-open';
    }
    return '<div class="mdui-panel mdui-panel-gapless" mdui-panel>
    <div class="mdui-panel-item'.$mdx_open.'">
      <div class="mdui-panel-item-header">
        <div class="mdui-panel-item-title">'.esc_html($title).'</div>
        <i class="mdui-panel-item-arrow mdui-icon material-icons">keyboard_arrow_down</i>
      </div>
      <div class="mdui-panel-item-body">
        <p>'.do_shortcode($content).'</p>
      </div>
    </div>
  </div>';
}
add_shortcode("mdx_fold", "mdx_shortcode_hide");

function mdx_shortcode_warning($atts, $content = null) {
    extract(shortcode_atts(array("title" => __('警告', 'mdx')), $atts));
    return '<blockquote class="mdx-warning"><p><i class="mdui-icon material-icons">&#xe002;</i> '.esc_html($title).'<br><strong>'.do_shortcode($content).'</strong></p></blockquote>';
}
add_shortcode("mdx_warning", "mdx_shortcode_warning");

function mdx_shortcode_table($atts, $content = '') {
    extract(shortcode_atts(array(
        'header' => 'false',
        'hover' => 'true'
    ), $atts));
    $output = '';
    $output2 = '';
    $trs = explode("\n&#8212;&#8211;", $content);
    $mdx_table_i = 0;
    foreach ($trs as $tr) {
        $tr = trim($tr);
        if ($mdx_table_i == 0 && $header == 'true') {
            if ($tr !== "") {
                $tds = explode("<br />", $tr);
                $output2 .= '<tr>';
                foreach ($tds as $td) {
                    $td = trim($td);
                    if ($td !== "") {
                        $output2 .= '<th>'.$td.'</th>';
                    }
                }
                $output2 .= '</tr>';
            }
        } else {
            if ($tr !== "") {
                $tds = explode("<br />", $tr);
                $output .= '<tr>';
                foreach ($tds as $td) {
                    $td = trim($td);
                    if ($td !== "") {
                        $output .= '<td>'.$td.'</td>';
                    }
                }
                $output .= '</tr>';
            }
        }
        $mdx_table_i++;
    }
    $hoverable = '';
    if ($hover == 'true') {
        $hoverable = ' mdui-table-hoverable';
    }
    if ($header == 'true') {
        $output2 = '<thead>'.$output2.'</thead>';
    }
    $output = '<div class="mdui-table-fluid'.$hoverable.'"><table class="mdui-table">'.$output2.'<tbody>'.$output.'</tbody></table></div>';
    return $output;
}
add_shortcode('mdx_table', 'mdx_shortcode_table');

function mdx_shortcode_progress($atts, $content = '0') {
    return '<div class="mdui-progress">
    <div class="mdui-progress-determinate" style="width: '.esc_attr($content).'%;"></div>
  </div>';
}
add_shortcode("mdx_progress", "mdx_shortcode_progress");

function mdx_shortcode_post($atts, $content = '') {
    return '<div class="mdx-post-cot" data-mdxposturl="'.esc_attr($content).'"><div class="mdx-post-wait-out-c2"><div class="mdx-post-wait-out-c mdui-valign"><div class="mdx-github-wait-out"><div class="mdx-github-wait"><a href="'.esc_attr($content).'"><div class="mdui-spinner"></div></a></div></div></div></div></div>';
}
add_shortcode("mdx_post", "mdx_shortcode_post");

function mdx_shortcode_github($atts, $content = '') {
    extract(shortcode_atts(array(
        'author' => '',
        'project' => '',
        'gateway' => 'https://api.github.com/'
    ), $atts));
    return '<div class="mdx-github-cot" data-mdxgithuba="'.esc_attr($author).'" data-mdxgithubp="'.esc_attr($project).'" data-mdxgithubg="'.esc_attr($gateway).'"><div class="mdx-github-wait-out-c2"><div class="mdx-github-wait-out-c mdui-valign"><div class="mdx-github-wait-out"><div class="mdx-github-wait"><a href="https://github.com/'.esc_attr($author).'/'.esc_attr($project).'"><div class="mdui-spinner"></div></a></div></div></div></div></div>';
}
add_shortcode("mdx_github", "mdx_shortcode_github");

function mdx_shortcode_ad($atts, $content = '') {
    if ((mdx_get_option('mdx_logged_in_ad') === "false" && !empty(mdx_get_option('mdx_ad'))) || ((mdx_get_option('mdx_logged_in_ad') === "true" && !is_user_logged_in()) && !empty(mdx_get_option('mdx_ad')))) {
        return '<div class="mdx-ad-in-article">'.htmlspecialchars_decode(mdx_get_option('mdx_ad')).'</div>';
    } else {
        return '';
    }
}
add_shortcode("mdx_ad", "mdx_shortcode_ad");

function mdx_shortcode_list($atts, $content = '') {
    extract(shortcode_atts(array('height' => ''), $atts));
    return '<ul class="mdx-sc-list mdui-list mdui-shadow-2"'.($height !== '' ? ' style="height:'.esc_attr($height).'px"' : '').'>'.do_shortcode(str_replace('<br />', '', $content)).'</ul>';
}
add_shortcode("mdx_list", "mdx_shortcode_list");

function mdx_shortcode_list_item($atts, $content = '') {
    extract(shortcode_atts(array(
        'action' => '',
        'blank' => 'false',
        'avatar' => '',
        'title' => '',
        'subtitle' => '',
    ), $atts));
    $html = '<li class="mdx-sc-list-item mdui-list-item mdui-ripple">'.($avatar !== '' ? '<div class="mdui-list-item-avatar"><img class="mdx-sc-list-avatar" src="'.esc_attr($avatar).'"></div>' : '').'<div class="mdx-sc-list-content mdui-list-item-content">'.($title !== '' ? '<div class="mdx-sc-list-title mdui-list-item-title">'.esc_html($title).'</div>' : '').($subtitle !== '' ? '<div class="mdx-sc-list-subtitle">'.esc_html($subtitle).'</div>' : '').($title !== '' || $subtitle !== '' ? '<div class="mdx-sc-list-body mdui-list-item-text">' : '').do_shortcode($content).($title !== '' || $subtitle !== '' ? '</div>' : '').'</div></li>';
    if ($action !== '') {
        $html = '<a href="'.esc_attr($action).'"'.($blank === 'true' ? ' target="_blank" rel="noopener"' : '').'>'.$html.'</a>';
    }
    return $html;
}
add_shortcode("mdx_list_item", "mdx_shortcode_list_item");

function mdx_add_button_fold() {
    if (!current_user_can('edit_posts') && !current_user_can('edit_pages')) {
        return;
    }
    if (get_user_option('rich_editing') == 'true') {
        add_filter('mce_external_plugins', 'mdx_add_plugin');
        add_filter('mce_buttons', 'mdx_register_button');
    }
}
add_action('init', 'mdx_add_button_fold');

function mdx_register_button($buttons) {
    array_push($buttons, "|", "mdx_fold");
    array_push($buttons, "", "mdx_warning");
    array_push($buttons, "", "mdx_table");
    array_push($buttons, "", "mdx_progress");
    array_push($buttons, "", "mdx_post");
    array_push($buttons, "", "mdx_github");
    array_push($buttons, "", "mdx_ad");
    array_push($buttons, "", "mdx_list");
    return $buttons;
}

function mdx_add_plugin($plugin_array) {
    $plugin_array['mdx_fold'] = get_template_directory_uri().'/js/sc1.js';
    $plugin_array['mdx_warning'] = get_template_directory_uri().'/js/sc1.js';
    $plugin_array['mdx_table'] = get_template_directory_uri().'/js/sc1.js';
    $plugin_array['mdx_progress'] = get_template_directory_uri().'/js/sc1.js';
    $plugin_array['mdx_post'] = get_template_directory_uri().'/js/sc1.js';
    $plugin_array['mdx_github'] = get_template_directory_uri().'/js/sc1.js';
    $plugin_array['mdx_ad'] = get_template_directory_uri().'/js/sc1.js';
    $plugin_array['mdx_list'] = get_template_directory_uri().'/js/sc1.js';
    return $plugin_array;
}

//Add Metaboxes
function mdx_post_metaboxes_2() {
    global $post;
    $meta_box_value = get_post_meta($post->ID, 'informations_value', true);
    echo '<input type="hidden" name="informations_noncename" id="informations_noncename" value="'.wp_create_nonce(plugin_basename(__FILE__)).'">';
    echo '<textarea rows="7" style="width:100%" name="informations_value">'.$meta_box_value.'</textarea>'.__('
        <p class="description">在这里为这篇文章设置单独的文末信息。若希望跟随全局设置请留空</p>', 'mdx');
}

function mdx_post_metaboxes_1() {
    global $post;
    get_post_meta($post->ID, 'settings_value', true);
?>
    <h4><?php _e('文章主题颜色', 'mdx'); ?></h4>
    <?php $mdx_v_styles = get_post_meta($post->ID, "mdx_styles", true); ?>
    <select name="mdx_styles" id="mdx_styles">
        <option value="def"
                <?php if ($mdx_v_styles == 'def' || $mdx_v_styles == ''){ ?>selected="selected"<?php } ?>><?php _e('跟随全局设置', 'mdx'); ?></option>
        <option value="red" <?php if ($mdx_v_styles == 'red'){ ?>selected="selected"<?php } ?>>Red</option>
        <option value="pink" <?php if ($mdx_v_styles == 'pink'){ ?>selected="selected"<?php } ?>>Pink</option>
        <option value="purple" <?php if ($mdx_v_styles == 'purple'){ ?>selected="selected"<?php } ?>>Purple</option>
        <option value="deep-purple" <?php if ($mdx_v_styles == 'deep-purple'){ ?>selected="selected"<?php } ?>>Deep
            Purple
        </option>
        <option value="indigo" <?php if ($mdx_v_styles == 'indigo'){ ?>selected="selected"<?php } ?>>Indigo</option>
        <option value="blue" <?php if ($mdx_v_styles == 'blue'){ ?>selected="selected"<?php } ?>>Blue</option>
        <option value="light-blue" <?php if ($mdx_v_styles == 'light-blue'){ ?>selected="selected"<?php } ?>>Light
            Blue
        </option>
        <option value="cyan" <?php if ($mdx_v_styles == 'cyan'){ ?>selected="selected"<?php } ?>>Cyan</option>
        <option value="teal" <?php if ($mdx_v_styles == 'teal'){ ?>selected="selected"<?php } ?>>Teal</option>
        <option value="green" <?php if ($mdx_v_styles == 'green'){ ?>selected="selected"<?php } ?>>Green</option>
        <option value="light-green" <?php if ($mdx_v_styles == 'light-green'){ ?>selected="selected"<?php } ?>>Light
            Green
        </option>
        <option value="lime" <?php if ($mdx_v_styles == 'lime'){ ?>selected="selected"<?php } ?>>Lime</option>
        <option value="yellow" <?php if ($mdx_v_styles == 'yellow'){ ?>selected="selected"<?php } ?>>Yellow</option>
        <option value="amber" <?php if ($mdx_v_styles == 'amber'){ ?>selected="selected"<?php } ?>>Amber</option>
        <option value="orange" <?php if ($mdx_v_styles == 'orange'){ ?>selected="selected"<?php } ?>>Orange</option>
        <option value="deep-orange" <?php if ($mdx_v_styles == 'deep-orange'){ ?>selected="selected"<?php } ?>>Deep
            Orange
        </option>
        <option value="brown" <?php if ($mdx_v_styles == 'brown'){ ?>selected="selected"<?php } ?>>Brown</option>
        <option value="grey" <?php if ($mdx_v_styles == 'grey'){ ?>selected="selected"<?php } ?>>Grey</option>
        <option value="blue-grey" <?php if ($mdx_v_styles == 'blue-grey'){ ?>selected="selected"<?php } ?>>Blue Grey
        </option>
        <option value="white" <?php if ($mdx_v_styles == 'white'){ ?>selected="selected"<?php } ?>>White</option>
    </select>
    <p class="description"><?php _e('在这里为这篇文章设置单独的主题颜色。', 'mdx'); ?></p>
    <br>
    <h4><?php _e('文章强调色', 'mdx'); ?></h4>
    <?php $mdx_v_styles_act = get_post_meta($post->ID, "mdx_styles_act", true); ?>
    <select name="mdx_styles_act" id="mdx_styles_act">
        <option value="def"
                <?php if ($mdx_v_styles_act == 'def' || $mdx_v_styles_act == ''){ ?>selected="selected"<?php } ?>><?php _e('跟随全局设置', 'mdx'); ?></option>
        <option value="red" <?php if ($mdx_v_styles_act == 'red'){ ?>selected="selected"<?php } ?>>Red</option>
        <option value="pink" <?php if ($mdx_v_styles_act == 'pink'){ ?>selected="selected"<?php } ?>>Pink</option>
        <option value="purple" <?php if ($mdx_v_styles_act == 'purple'){ ?>selected="selected"<?php } ?>>Purple</option>
        <option value="deep-purple" <?php if ($mdx_v_styles_act == 'deep-purple'){ ?>selected="selected"<?php } ?>>Deep
            Purple
        </option>
        <option value="indigo" <?php if ($mdx_v_styles_act == 'indigo'){ ?>selected="selected"<?php } ?>>Indigo</option>
        <option value="blue" <?php if ($mdx_v_styles_act == 'blue'){ ?>selected="selected"<?php } ?>>Blue</option>
        <option value="light-blue" <?php if ($mdx_v_styles_act == 'light-blue'){ ?>selected="selected"<?php } ?>>Light
            Blue
        </option>
        <option value="cyan" <?php if ($mdx_v_styles_act == 'cyan'){ ?>selected="selected"<?php } ?>>Cyan</option>
        <option value="teal" <?php if ($mdx_v_styles_act == 'teal'){ ?>selected="selected"<?php } ?>>Teal</option>
        <option value="green" <?php if ($mdx_v_styles_act == 'green'){ ?>selected="selected"<?php } ?>>Green</option>
        <option value="light-green" <?php if ($mdx_v_styles_act == 'light-green'){ ?>selected="selected"<?php } ?>>Light
            Green
        </option>
        <option value="lime" <?php if ($mdx_v_styles_act == 'lime'){ ?>selected="selected"<?php } ?>>Lime</option>
        <option value="yellow" <?php if ($mdx_v_styles_act == 'yellow'){ ?>selected="selected"<?php } ?>>Yellow</option>
        <option value="amber" <?php if ($mdx_v_styles_act == 'amber'){ ?>selected="selected"<?php } ?>>Amber</option>
        <option value="orange" <?php if ($mdx_v_styles_act == 'orange'){ ?>selected="selected"<?php } ?>>Orange</option>
        <option value="deep-orange" <?php if ($mdx_v_styles_act == 'deep-orange'){ ?>selected="selected"<?php } ?>>Deep
            Orange
        </option>
    </select>
    <p class="description"><?php _e('在这里为这篇文章设置单独的强调色。', 'mdx'); ?></p>
    <br>
    <h4><?php _e('文章样式', 'mdx'); ?></h4>
    <?php $mdx_v_post_style = get_post_meta($post->ID, "mdx_post_style", true); ?>
    <select name="mdx_post_style" id="mdx_post_style">
        <option value="def"
                <?php if ($mdx_v_post_style == 'def' || $mdx_v_post_style == ''){ ?>selected="selected"<?php } ?>><?php _e('跟随全局设置', 'mdx'); ?></option>
        <option value="0"
                <?php if ($mdx_v_post_style == '0'){ ?>selected="selected"<?php } ?>><?php _e('标准', 'mdx'); ?></option>
        <option value="1"
                <?php if ($mdx_v_post_style == '1'){ ?>selected="selected"<?php } ?>><?php _e('简洁', 'mdx'); ?></option>
        <option value="2"
                <?php if ($mdx_v_post_style == '2'){ ?>selected="selected"<?php } ?>><?php _e('通透', 'mdx'); ?></option>
        <option value="3"
                <?php if ($mdx_v_post_style == '3'){ ?>selected="selected"<?php } ?>><?php _e('朴素', 'mdx'); ?></option>
    </select>
    <p class="description"><?php _e('在这里为这篇文章设置单独的样式。', 'mdx'); ?></p>
    <br>
    <h4><?php _e('文章展示模式', 'mdx'); ?></h4>
    <?php $mdx_v_post_show = get_post_meta($post->ID, "mdx_post_show", true); ?>
    <select name="mdx_post_show" id="mdx_post_show">
        <option value="0"
                <?php if ($mdx_v_post_show == '0' || $mdx_v_post_show == ''){ ?>selected="selected"<?php } ?>><?php _e('正常显示', 'mdx'); ?></option>
        <option value="1"
                <?php if ($mdx_v_post_show == '1'){ ?>selected="selected"<?php } ?>><?php _e('404模式', 'mdx'); ?></option>
        <option value="2"
                <?php if ($mdx_v_post_show == '2'){ ?>selected="selected"<?php } ?>><?php _e('隐藏模式', 'mdx'); ?></option>
        <option value="3"
                <?php if ($mdx_v_post_show == '3'){ ?>selected="selected"<?php } ?>><?php _e('对游客隐藏模式', 'mdx'); ?></option>
    </select>
    <p class="description"><?php _e('在这里为这篇文章设置展示模式。<br>404 模式：当访客进入此文章时，会显示 404 页面<br>隐藏模式：当访客进入此文章时，会显示“根据相关法律法规，此文章暂时不予显示”<br>对游客隐藏模式：若访问者未登录，则显示“登录后才能查看此文章”<br>若使用前两种模式，这篇文章将可在首页找到或是被搜索到。但无论何种模式都不会发送 HTTP 404 头。', 'mdx'); ?></p>
    </fieldset>
<?php
}

function create_meta_box() {
    add_meta_box('mdx_post_metaboxes_1', __('文章设置', 'mdx'), 'mdx_post_metaboxes_1', 'post', 'side', 'low');
    add_meta_box('mdx_post_metaboxes_2', __('文末信息', 'mdx'), 'mdx_post_metaboxes_2', 'post', 'normal', 'low');
}
// 使用正确的 add_meta_boxes 钩子（旧代码挂在 admin_menu 上，虽然可用但不规范）
add_action('add_meta_boxes', 'create_meta_box');

function mdx_save_postdata_1($post_id, $post) {
    // 自动保存、修订版本、自动草稿、批量编辑等场景下不处理，避免 PHP 警告与元数据被清空
    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
        return;
    }
    if (wp_is_post_revision($post_id) || wp_is_post_autosave($post_id)) {
        return;
    }
    if (empty($_POST['informations_noncename']) || !wp_verify_nonce($_POST['informations_noncename'], plugin_basename(__FILE__))) {
        return;
    }
    if (!current_user_can('edit_post', $post_id)) {
        return;
    }

    if (isset($_POST['informations_value'])) {
        update_post_meta((int) $post_id, 'informations_value', wp_kses_post(wp_unslash($_POST['informations_value'])));
    }

    $mdx_color_arr = array(
        'red' => '#f44336',
        'pink' => '#e91e63',
        'purple' => '#9c27b0',
        'deep-purple' => '#673ab7',
        'indigo' => '#3f51b5',
        'blue' => '#2196f3',
        'light-blue' => '#03a9f4',
        'cyan' => '#00bcd4',
        'teal' => '#009688',
        'green' => '#4caf50',
        'light-green' => '#8bc34a',
        'lime' => '#cddc39',
        'yellow' => '#ffeb3b',
        'amber' => '#ffc107',
        'orange' => '#ff9800',
        'deep-orange' => '#ff5722',
        'brown' => '#795548',
        'grey' => '#9e9e9e',
        'blue-grey' => '#607d8b',
        'white' => '#9e9e9e',
        'def' => 'def',
    );
    $mdx_act_arr = array(
        'red' => '#ff5252',
        'pink' => '#ff4081',
        'purple' => '#e040fb',
        'deep-purple' => '#7c4dff',
        'indigo' => '#536dfe',
        'blue' => '#448aff',
        'light-blue' => '#40c4ff',
        'cyan' => '#18ffff',
        'teal' => '#64ffda',
        'green' => '#69f0ae',
        'light-green' => '#b2ff59',
        'lime' => '#eeff41',
        'yellow' => '#ffff00',
        'amber' => '#ffd740',
        'orange' => '#ffab40',
        'deep-orange' => '#ff6e40',
        'def' => 'def',
    );

    $mdx_style_value = isset($_POST['mdx_styles']) ? sanitize_text_field(wp_unslash($_POST['mdx_styles'])) : null;
    if ($mdx_style_value !== null) {
        update_post_meta((int) $post_id, 'mdx_styles', $mdx_style_value);
        if (isset($mdx_color_arr[$mdx_style_value])) {
            update_post_meta((int) $post_id, 'mdx_styles_hex', $mdx_color_arr[$mdx_style_value]);
        }
    }

    $mdx_act_value = isset($_POST['mdx_styles_act']) ? sanitize_text_field(wp_unslash($_POST['mdx_styles_act'])) : null;
    if ($mdx_act_value !== null) {
        update_post_meta((int) $post_id, 'mdx_styles_act', $mdx_act_value);
        if (isset($mdx_act_arr[$mdx_act_value])) {
            update_post_meta((int) $post_id, 'mdx_styles_act_hex', $mdx_act_arr[$mdx_act_value]);
        }
    }

    $mdx_post_style_value = isset($_POST['mdx_post_style']) ? sanitize_text_field(wp_unslash($_POST['mdx_post_style'])) : null;
    if ($mdx_post_style_value !== null) {
        update_post_meta((int) $post_id, 'mdx_post_style', $mdx_post_style_value);
    }

    $mdx_post_show_value = isset($_POST['mdx_post_show']) ? sanitize_text_field(wp_unslash($_POST['mdx_post_show'])) : null;
    if ($mdx_post_show_value !== null) {
        update_post_meta((int) $post_id, 'mdx_post_show', $mdx_post_show_value);
    }
}
add_action('save_post', 'mdx_save_postdata_1', 10, 2);

function mdx_colored_cloud($text) {
    return preg_replace_callback('/<a (.+?)>/i', 'mdx_colored_cloud_call_back', $text);
}

function mdx_colored_cloud_call_back($matches) {
    $text = $matches[1];
    $color = dechex(rand(0, 16777215));
    $text = str_replace("style=\"", "style=\"color:#$color;", $text);
    $text = str_replace("style='", "style='color:#$color;", $text);
    return "<a $text>";
}

if (mdx_get_option('mdx_tags_color') === "true") {
    add_filter('wp_tag_cloud', 'mdx_colored_cloud', 1);
}

//Enable basic functions for classic editor
function mdx_add_editor_buttons($buttons) {
    $buttons[] = 'fontselect';
    $buttons[] = 'fontsizeselect';
    $buttons[] = 'backcolor';
    $buttons[] = 'underline';
    $buttons[] = 'hr';
    $buttons[] = 'cut';
    $buttons[] = 'copy';
    $buttons[] = 'paste';
    return $buttons;
}
add_filter("mce_buttons_2", "mdx_add_editor_buttons");

?>