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  • WordPress主题开发必备的10个函数
  • WordPress主题开发必备的10个函数

    作者:胡永云

    日期:2020年03月18日

    在WordPress主题开发的时候,有几个必备的函数,在这里给大家罗列一下:

    1、去除分类代码标志category

    //去除分类标志代码
    add_action( 'load-themes.php',  'no_category_base_refresh_rules');
    add_action('created_category', 'no_category_base_refresh_rules');
    add_action('edited_category', 'no_category_base_refresh_rules');
    add_action('delete_category', 'no_category_base_refresh_rules');
    function no_category_base_refresh_rules() {
        global $wp_rewrite;
        $wp_rewrite -> flush_rules();
    }
    // register_deactivation_hook(__FILE__, 'no_category_base_deactivate');
    // function no_category_base_deactivate() {
    //  remove_filter('category_rewrite_rules', 'no_category_base_rewrite_rules');
    //  // We don't want to insert our custom rules again
    //  no_category_base_refresh_rules();
    // }
    // Remove category base
    add_action('init', 'no_category_base_permastruct');
    function no_category_base_permastruct() {
        global $wp_rewrite, $wp_version;
        if (version_compare($wp_version, '3.4', '<')) {
            // For pre-3.4 support
            $wp_rewrite -> extra_permastructs['category'][0] = '%category%';
        } else {
            $wp_rewrite -> extra_permastructs['category']['struct'] = '%category%';
        }
    }
    // Add our custom category rewrite rules
    add_filter('category_rewrite_rules', 'no_category_base_rewrite_rules');
    function no_category_base_rewrite_rules($category_rewrite) {
        //var_dump($category_rewrite); // For Debugging
        $category_rewrite = array();
        $categories = get_categories(array('hide_empty' => false));
        foreach ($categories as $category) {
            $category_nicename = $category -> slug;
            if ($category -> parent == $category -> cat_ID)// recursive recursion
                $category -> parent = 0;
            elseif ($category -> parent != 0)
                $category_nicename = get_category_parents($category -> parent, false, '/', true) . $category_nicename;
            $category_rewrite['(' . $category_nicename . ')/(?:feed/)?(feed|rdf|rss|rss2|atom)/?$'] = 'index.php?category_name=$matches[1]&feed=$matches[2]';
            $category_rewrite['(' . $category_nicename . ')/page/?([0-9]{1,})/?$'] = 'index.php?category_name=$matches[1]&paged=$matches[2]';
            $category_rewrite['(' . $category_nicename . ')/?$'] = 'index.php?category_name=$matches[1]';
        }
        // Redirect support from Old Category Base
        global $wp_rewrite;
        $old_category_base = get_option('category_base') ? get_option('category_base') : 'category';
        $old_category_base = trim($old_category_base, '/');
        $category_rewrite[$old_category_base . '/(.*)$'] = 'index.php?category_redirect=$matches[1]';
        //var_dump($category_rewrite); // For Debugging
        return $category_rewrite;
    }
    // Add 'category_redirect' query variable
    add_filter('query_vars', 'no_category_base_query_vars');
    function no_category_base_query_vars($public_query_vars) {
        $public_query_vars[] = 'category_redirect';
        return $public_query_vars;
    }
    // Redirect if 'category_redirect' is set
    add_filter('request', 'no_category_base_request');
    function no_category_base_request($query_vars) {
        //print_r($query_vars); // For Debugging
        if (isset($query_vars['category_redirect'])) {
            $catlink = trailingslashit(get_option('home')) . user_trailingslashit($query_vars['category_redirect'], 'category');
            status_header(301);
            header("Location: $catlink");
            exit();
        }
        return $query_vars;
    }

    2、禁用谷歌字体

    //谷歌字体
    function remove_open_sans() {
        wp_deregister_style( 'open-sans' );
        wp_register_style( 'open-sans', false );
        wp_enqueue_style('open-sans','');
    }
    add_action( 'init', 'remove_open_sans' );

    3、禁json

    //禁json
    add_filter('rest_enabled', '_return_false');
    add_filter('rest_jsonp_enabled', '_return_false');
    remove_action( 'wp_head', 'rest_output_link_wp_head', 10 );
    remove_action( 'wp_head', 'wp_oembed_add_discovery_links', 10 );

    4、禁emoj

    //禁emoj
    function disable_embeds_init() {
        /* @var WP $wp */
        global $wp;
        // Remove the embed query var.
        $wp->public_query_vars = array_diff( $wp->public_query_vars, array(
            'embed',
        ) );
        // Remove the REST API endpoint.
        remove_action( 'rest_api_init', 'wp_oembed_register_route' );
        // Turn off
        add_filter( 'embed_oembed_discover', '__return_false' );
        // Don't filter oEmbed results.
        remove_filter( 'oembed_dataparse', 'wp_filter_oembed_result', 10 );
        // Remove oEmbed discovery links.
        remove_action( 'wp_head', 'wp_oembed_add_discovery_links' );
        // Remove oEmbed-specific JavaScript from the front-end and back-end.
        remove_action( 'wp_head', 'wp_oembed_add_host_js' );
        add_filter( 'tiny_mce_plugins', 'disable_embeds_tiny_mce_plugin' );
        // Remove all embeds rewrite rules.
        add_filter( 'rewrite_rules_array', 'disable_embeds_rewrites' );
    }
    add_action( 'init', 'disable_embeds_init', 9999 );

    5、冒充评论检验

    //冒充评论检验
    function CheckEmailAndName(){
    	global $wpdb;
    	$comment_author       = ( isset($_POST['author']) )  ? trim(strip_tags($_POST['author'])) : null;
    	$comment_author_email = ( isset($_POST['email']) )   ? trim($_POST['email']) : null;
    	if(!$comment_author || !$comment_author_email){
    		return;
    	}
    	$result_set = $wpdb->get_results("SELECT display_name, user_email FROM $wpdb->users WHERE display_name = '" . $comment_author . "' OR user_email = '" . $comment_author_email . "'");
    	if ($result_set) {
    		if ($result_set[0]->display_name == $comment_author){
    			err(__('警告: 您不能使用博主的昵称!'));
    		}else{
    			err(__('警告: 您不能使用博主的邮箱!'));
    		}
    		fail($errorMessage);
    	}
    }
    add_action('pre_comment_on_post', 'CheckEmailAndName');

    6、评论回复邮件通知(所有回复都邮件通知)*(美化版)

    //评论回复邮件通知(所有回复都邮件通知)*(美化版)
    function comment_mail_notify($comment_id) {
    $comment = get_comment($comment_id);
    $parent_id = $comment->comment_parent ? $comment->comment_parent : '';
    $spam_confirmed = $comment->comment_approved;
    if (($parent_id != '') && ($spam_confirmed != 'spam')) {
    $wp_email = 'no-reply@' . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME'])); //e-mail 发出点, no-reply 可改为可用的 e-mail.
    $to = trim(get_comment($parent_id)->comment_author_email);
    $subject = '您在 [' . get_option("blogname") . '] 的留言有了回复';
    $message = '
    <div style="background-color:#fff; border:1px solid #666666; color:#111;
    -moz-border-radius:8px; -webkit-border-radius:8px; -khtml-border-radius:8px;
    border-radius:8px; font-size:12px; width:702px; margin:0 auto; margin-top:10px;
    font-family:微软雅黑, Arial;">
    <div style="background:#666666; width:100%; height:60px; color:white;
    -moz-border-radius:6px 6px 0 0; -webkit-border-radius:6px 6px 0 0;
    -khtml-border-radius:6px 6px 0 0; border-radius:6px 6px 0 0; ">
    <span style="height:60px; line-height:60px; margin-left:30px; font-size:12px;">
    您在<a style="text-decoration:none; color:#00bbff;font-weight:600;"
    href="' . get_option('home') . '">' . get_option('blogname') . '
    </a>博客上的留言有回复啦!</span></div>
    <div style="width:90%; margin:0 auto">
    <p>' . trim(get_comment($parent_id)->comment_author) . ', 您好!</p>
    <p>您曾在 [' . get_option("blogname") . '] 的文章
    《' . get_the_title($comment->comment_post_ID) . '》 上发表评论:
    <p style="background-color: #EEE;border: 1px solid #DDD;
    padding: 20px;margin: 15px 0;">' . nl2br(get_comment($parent_id)->comment_content) . '</p>
    <p>' . trim($comment->comment_author) . ' 给您的回复如下:
    <p style="background-color: #EEE;border: 1px solid #DDD;padding: 20px;
    margin: 15px 0;">' . nl2br($comment->comment_content) . '</p>
    <p>您可以点击 <a style="text-decoration:none; color:#00bbff"
    href="' . htmlspecialchars(get_comment_link($parent_id)) . '">查看回复的完整內容</a></p>
    <p>欢迎再次光临 <a style="text-decoration:none; color:#00bbff"
    href="' . get_option('home') . '">' . get_option('blogname') . '</a></p>
    <p>(此邮件由系统自动发出, 请勿回复.)</p>
    </div>
    </div>';
    $message = convert_smilies($message);
    $from = "From: \"" . get_option('blogname') . "\" <$wp_email>";
    $headers = "$from\nContent-Type: text/html; charset=" . get_option('blog_charset') . "\n";
    wp_mail( $to, $subject, $message, $headers );
    //echo 'mail to ', $to, '<br/> ' , $subject, $message; // for testing
    }
    }
    add_action('comment_post', 'comment_mail_notify');

    7、移除顶部多余信息

    //移除顶部多余信息
    remove_action( 'wp_head', 'feed_links', 2 ); //移除feed
    remove_action( 'wp_head', 'feed_links_extra', 3 ); //移除feed
    remove_action( 'wp_head', 'rsd_link' ); //移除离线编辑器开放接口
    remove_action( 'wp_head', 'wlwmanifest_link' );  //移除离线编辑器开放接口
    remove_action( 'wp_head', 'index_rel_link' );//去除本页唯一链接信息
    remove_action('wp_head', 'parent_post_rel_link', 10, 0 );//清除前后文信息
    remove_action('wp_head', 'start_post_rel_link', 10, 0 );//清除前后文信息
    remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0 );
    remove_action( 'wp_head', 'locale_stylesheet' );
    remove_action('publish_future_post','check_and_publish_future_post',10, 1 );
    remove_action( 'wp_head', 'noindex', 1 );
    remove_action( 'wp_head', 'wp_print_styles', 8 );//载入css
    remove_action( 'wp_head', 'wp_print_head_scripts', 9 );
    remove_action( 'wp_head', 'wp_generator' ); //移除WordPress版本
    remove_action( 'wp_head', 'rel_canonical' );
    remove_action( 'wp_footer', 'wp_print_footer_scripts' );
    remove_action( 'wp_head', 'wp_shortlink_wp_head', 10, 0 );
    remove_action( 'template_redirect', 'wp_shortlink_header', 11, 0 );
    add_action('widgets_init', 'my_remove_recent_comments_style');
    function my_remove_recent_comments_style() {
    global $wp_widget_factory;
    remove_action('wp_head', array($wp_widget_factory->widgets['WP_Widget_Recent_Comments'] ,'recent_comments_style'));
    }

    8、删除仪表盘模块

    //删除仪表盘模块
    function example_remove_dashboard_widgets() {
        // Globalize the metaboxes array, this holds all the widgets for wp-admin
        global $wp_meta_boxes;
        // 以下这一行代码将删除 "快速发布" 模块
        unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_quick_press']);
        // 以下这一行代码将删除 "引入链接" 模块
        unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_incoming_links']);
        // 以下这一行代码将删除 "插件" 模块
        unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_plugins']);
        // 以下这一行代码将删除 "近期评论" 模块
        unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_recent_comments']);
        // 以下这一行代码将删除 "近期草稿" 模块
        unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_recent_drafts']);
        // 以下这一行代码将删除 "WordPress 开发日志" 模块
        unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_primary']);
        // 以下这一行代码将删除 "其它 WordPress 新闻" 模块
        unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary']);
        // 以下这一行代码将删除 "概况" 模块
        unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_right_now']);
    }
    add_action('wp_dashboard_setup', 'example_remove_dashboard_widgets' );

    9、垃圾评论过滤

    /* 垃圾评论 */  
    function refused_spam_comments( $comment_data ) {  
    $pattern = '/[一-龥]/u';  
    if(!preg_match($pattern,$comment_data['comment_content'])) {  
    err('评论必须含中文!');  
    }  
    return( $comment_data );  
    }  
    add_filter('preprocess_comment','refused_spam_comments');

    10、头像本地缓存,主题根目录下新建一个avatar文件夹。

    //头像本地缓存
    function lerm_avatar_cache( $avatar ){
        $tmp  = strpos( $avatar, 'http' );
        $g    = substr( $avatar, $tmp, strpos( $avatar, '\'', $tmp ) - $tmp );
        $tmp  = strpos( $g, 'avatar/' ) + 7;
        $f    = substr( $g, $tmp, strpos( $g, '?', $tmp ) - $tmp );//匹配图片名称
        $e    = get_template_directory() . '/avatar/' . $f . '.png';//图片缓存路径
        $t    = 604800; //缓存天数
        if( !is_file( $e ) || ( time() - filemtime( $e ) ) > $t ) copy( htmlspecialchars_decode( $g ), $e );
        else $avatar = strtr( $avatar, array( $g => get_template_directory_uri() . '/avatar/' . $f . '.png' ) );
        if( filesize( $e ) < 500 ) copy( get_template_directory()  . '/avatar/default.png', $e );
        return $avatar;
    }
    add_filter('get_avatar', 'lerm_avatar_cache' );

     

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