功能类

/* 增加菜单功能
*  wp_nav_menu($args);
*/
function caper_register_nav_menus()
{
    register_nav_menus(array(
        'header_menu' => __('顶部菜单', 'Bing'),
        'footer_menu' => __('页脚菜单', 'Bing')
    ));
}
add_action('init', 'caper_register_nav_menus');

/* 增加友情链接
*  wp_list_bookmarks ( $args );
*/
add_filter('pre_option_link_manager_enabled', '__return_true');

/* 缩略图功能
*  if (has_post_thumbnail()):
*    the_post_thumbnail();
*  endif;
*/
if (function_exists('add_theme_support')) {
    add_theme_support('post-thumbnails', array('post', 'page'));
}
//  上传图片重命名
function caper_upload_filter($file)
{
    $info = pathinfo($file['name']);
    $ext = $info['extension'];
    $filedate = date('YmdHis') . rand(10, 99);
    $file['name'] = $filedate . '.' . $ext;
    return $file;
}
add_filter('wp_handle_upload_prefilter', 'caper_upload_filter');

//  限制上传图片大小
function caper_set_limit_image_size($file)
{
    $image_size = $file['size'] / 1024;
    $limit = 2048;
    $is_image = strpos($file['type'], 'image');
    if (($image_size > $limit) && ($is_image !== false)) {
        $file['error'] = '上传图片大于2M，请先处理';
    }
    return $file;
}

add_filter('wp_handle_upload_prefilter', 'caper_set_limit_image_size');

//  限制缩略图生成其他尺寸
function caper_disable_image_sizes($sizes)
{
    unset($sizes['thumbnail']);
    unset($sizes['medium']);
    unset($sizes['large']);
    unset($sizes['medium_large']);
    unset($sizes['1536x1536']);
    unset($sizes['2048x2048']);
    return $sizes;
}
add_action('intermediate_image_sizes_advanced', 'caper_disable_image_sizes');
add_filter('big_image_size_threshold', '__return_false');

function caper_disable_other_image_sizes()
{
    remove_image_size('post-thumbnail');
    remove_image_size('another-size');
}
add_action('init', 'caper_disable_other_image_sizes');

//  禁止压缩JGP图片质量
add_filter('jpg_quality', 'caper_high_jpg_quality');
function caper_high_jpg_quality()
{
    return 100;
}

//  移除外观主题自定义功能
function caper_remove_customize($caps, $cap){
    if ($cap == 'customize') {
        return ['do_not_allow'];
    }
    return $caps;
}
add_filter("map_meta_cap", "caper_remove_customize", 10, 2);

//  禁用中的搜索功能
function caper_disable_wp_search($query, $error = true)
{

    if (is_search()) {
        $query->is_search = false;
        $query->query_vars[s] = false;
        $query->query[s] = false;

        // to error
        if ($error == true)
            $query->is_404 = true;
    }
}
add_action('parse_query', 'caper_disable_wp_search');
add_filter('get_search_form', create_function('$a', "return null;"));

//  搜索结果排除页面，只显示文章类型
function caper_advanced_search_query($query)
{
    if (!is_admin() && $query->is_main_query() && $query->is_search()) {
        //REST OF YOUR CODE
        $query->set('post_type', 'post');
    }
    return $query;
}
add_filter('pre_get_posts', 'caper_advanced_search_query', 1000);

//  只搜索文章的标题
function caper_search_by_title_only($query)
{
    if (!is_admin() && $query->is_main_query() && $query->is_search()) {
        $query->set('post_type', 'post');     // 只搜索文章类型
        $query->set('s', get_search_query()); // 使用搜索关键词
        $query->set('posts_per_page', -1);    // 显示所有匹配结果
        $query->set('exact', true);           // 精确匹配标题
        $query->set('sentence', true);        // 匹配整个搜索词
    }
}
add_filter('posts_search', 'caper_search_by_title_only', 500, 2);

//  搜索关键词高亮
function caper_search_word_replace($buffer){
    if(is_search()){
        $arr = explode(" ", get_search_query());
        $arr = array_unique($arr);
        foreach($arr as $v)
            if($v)
                $buffer = preg_replace("/(".$v.")/i", "<em>$1</em>", $buffer);
    }
    return $buffer;
}
add_filter("the_title", "caper_search_word_replace", 200);
add_filter("the_excerpt", "caper_search_word_replace", 200);
add_filter("the_content", "caper_search_word_replace", 200);

//  移除后台“显示选项”和“帮助”选项卡
function caper_screen_options_remove()
{
    return false;
}
function remove_wp_help($old_help, $screen_id, $screen)
{
    $screen->remove_help_tabs();
    return $old_help;
}
add_filter('screen_options_show_screen', 'caper_screen_options_remove');
add_filter('contextual_help', 'remove_wp_help', 999, 3);

//  阻止站内文章互相Pingback
function caper_bing_noself_ping($links)
{
    $home = get_option('home');
    foreach ($links as $l => $link) {
        if (0 === strpos($link, $home)) {
            unset($links[$l]);
        }
    }
}
add_action('pre_ping', 'caper_bing_noself_ping');

//  在媒体库显示文件尺寸及文件大小
function caper_size_column_register($columns)
{
    $columns['dimensions'] = __('Dimensions');
    return $columns;
}
add_filter('manage_upload_columns', 'caper_size_column_register');
function caper_size_column_display($column_name, $post_id)
{
    if ('dimensions' != $column_name || !wp_attachment_is_image($post_id))
        return;
    list($url, $width, $height) = wp_get_attachment_image_src($post_id, 'full');
    $filesize = size_format(@filesize(get_attached_file($post_id)));
    echo esc_html("{$width}×{$height}   Size={$filesize}");
}
add_action('manage_media_custom_column', 'caper_size_column_display', 10, 2);


//  分类目录url追加/
//  启用下面的文章格式支持：aside, gallery, quote, image, and video
//  移除后台“显示选项”和“帮助”选项卡
//  限制文章标题输入字数
//  新文章自动使用ID作为别名
//  定义内容宽度(如图片）,允许添加到网站的任何内容的最大宽度
//  为文章中所有链接添加target="_blank"属性
//  自定义登录界面
//  外链加上nofollow

//  使用<?php post_views('', '次');?>
function record_visitors()
{
    if (is_singular()) {
        global $post;
        $post_ID = $post->ID;
        if ($post_ID) {
            $post_views = (int) get_post_meta($post_ID, 'views', true);
            if (!update_post_meta($post_ID, 'views', ($post_views + 1))) {
                add_post_meta($post_ID, 'views', 1, true);
            }
        }
    }
}
add_action('wp_head', 'record_visitors');
function post_views($before = '(', $after = ')', $echo = 1)
{
    global $post;
    $post_ID = $post->ID;
    $views = (int) get_post_meta($post_ID, 'views', true);
    if ($echo) {
        echo $before, number_format($views), $after;
    } else {
        return $views;
    }
}

//  调用<?php echo caper_reading_time();?>
function caper_reading_time()
{
    $content = get_post_field('post_content', $post->ID);
    $word_count = str_word_count(strip_tags($content));
    $readingtime = ceil($word_count / 200);
    if ($readingtime == 1) {
        $timer = " minute";
    } else {
        $timer = " minutes";
    }
    $totalreadingtime = $readingtime . $timer;
    return $totalreadingtime;
}