1、在header中添加RSS链接

// add feed links to header
if (function_exists('automatic_feed_links')) {
	automatic_feed_links();
} else {
	return;
}

2、加载自定义jQuery库

// smart jquery inclusion
if (!is_admin()) {
 wp_deregister_script('jquery');
 wp_register_script('jquery', ("http://ajax.useso.com/ajax/libs/jquery/1/jquery.min.js"), false);
 wp_enqueue_script('jquery');
}

3、适应层叠评论

// enable threaded comments
function enable_threaded_comments(){
 if (!is_admin()) {
 if (is_singular() AND comments_open() AND (get_option('thread_comments') == 1))
 wp_enqueue_script('comment-reply');
 }
}
add_action('get_header', 'enable_threaded_comments');

4、去除多余头部信息代码

// remove junk from head
remove_action('wp_head', 'rsd_link');
remove_action('wp_head', 'wp_generator');
remove_action('wp_head', 'feed_links', 2);
remove_action('wp_head', 'index_rel_link');
remove_action('wp_head', 'wlwmanifest_link');
remove_action('wp_head', 'feed_links_extra', 3);
remove_action('wp_head', 'start_post_rel_link', 10, 0);
remove_action('wp_head', 'parent_post_rel_link', 10, 0);
remove_action('wp_head', 'adjacent_posts_rel_link', 10, 0);

5、在footer添加统计代码

// add tongji to footer
function add_tongji() {
 echo '<script src="统计代码" type="text/javascript"></script>';
}
add_action('wp_footer', 'add_tongji');

6、自定义摘要长度

// custom excerpt length
function custom_excerpt_length($length) {
 return 80;
}
add_filter('excerpt_length', 'custom_excerpt_length');

7、自定义摘要结尾的截断

// custom excerpt ellipses for 2.9+
function custom_excerpt_more($more) {
 return '...';
}
add_filter('excerpt_more', 'custom_excerpt_more');

8、自定义摘要结尾的继续阅读

// no more jumping for read more link
function no_more_jumping($post) {
 return '<a href="'.get_permalink($post->ID).'" class="read-more">'.'阅读更多'.'</a>';
}
add_filter('excerpt_more', 'no_more_jumping');

9、给WordPress添加全站图标favicon

// add a favicon to your 
function blog_favicon() {
 echo '<link rel="Shortcut Icon" type="image/x-icon" href="'.get_bloginfo('wpurl').'/favicon.ico" />';
}
add_action('wp_head', 'blog_favicon');

10、给WordPress后台添加图标favicon

// add a favicon for your admin
function admin_favicon() {
 echo '<link rel="Shortcut Icon" type="image/x-icon" href="'.get_bloginfo('stylesheet_directory').'/img/favicon.png" />';
}
add_action('admin_head', 'admin_favicon');

11、自定义登陆页面logo

// custom admin login logo
function custom_login_logo() {
 echo '<style type="text/css">
 h1 a { background-image: url('.get_bloginfo('template_directory').'/img/login-logo.png) !important; }
 </style>';
}
add_action('login_head', 'custom_login_logo');

12、禁用小工具

// disable all widget areas
function disable_all_widgets($sidebars_widgets) {
 //if (is_home())
 $sidebars_widgets = array(false);
 return $sidebars_widgets;
}
add_filter('sidebars_widgets', 'disable_all_widgets');

13、取消后台的更新提示

// kill the admin nag
if (!current_user_can('edit_users')) {
 add_action('init', create_function('$a', "remove_action('init', 'wp_version_check');"), 2);
 add_filter('pre_option_update_core', create_function('$a', "return null;"));
}

14、在body_class 和 post_class中包含分类id

// category id in body and post class
function category_id_class($classes) {
 global $post;
 foreach((get_the_category($post->ID)) as $category)
 $classes [] = 'cat-' . $category->cat_ID . '-id';
 return $classes;
}
add_filter('post_class', 'category_id_class');
add_filter('body_class', 'category_id_class');

15、获取第一个分类id

// get the first category id
function get_first_category_ID() {
 $category = get_the_category();
 return $category[0]->cat_ID;
}

16、在面额文章以及feed之后插入自定义内容

// add custom content to feeds and posts
function add_custom_content($content) {
 if(!is_home()) {
 $content .= '<p>This article is copyright © '.date('Y').' '.bloginfo('name').'</p>';
 }
 return $content;
}
add_filter('the_excerpt_rss', 'add_custom_content');
add_filter('the_content', 'add_custom_content');

17、隐藏WordPress版本号

// remove version info from head and feeds
function complete_version_removal() {
 return '';
}
add_filter('the_generator', 'complete_version_removal');

18、自定义后台左下角的文字

// customize admin footer text
function custom_admin_footer() {
 echo '么么哒';
} 
add_filter('admin_footer_text', 'custom_admin_footer');

19、用户描述里面使用HTML代码

// enable html markup in user profiles
remove_filter('pre_user_description', 'wp_filter_kses');

20、文章发布之后延迟rss的推送

// delay feed update
function publish_later_on_feed($where) {
 global $wpdb;
 
 if (is_feed()) {
 // timestamp in WP-format
 $now = gmdate('Y-m-d H:i:s');
 
 // value for wait; + device
 $wait = '5'; // integer
 
 // http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html#function_timestampdiff
 $device = 'MINUTE'; // MINUTE, HOUR, DAY, WEEK, MONTH, YEAR
 
 // add SQL-sytax to default $where
 $where .= " AND TIMESTAMPDIFF($device, $wpdb->posts.post_date_gmt, '$now') > $wait ";
 }
 return $where;
}
add_filter('posts_where', 'publish_later_on_feed');

21、后台菜单添加所有设置菜单

// admin link for all settings
function all_settings_link() {
 add_options_page(__('全部设置'), __('全部设置'), 'administrator', 'options.php');
}
add_action('admin_menu', 'all_settings_link');

22、移除评论中的nofollow属性

// remove nofollow from comments
function xwp_dofollow($str) {
 $str = preg_replace(
 '~<a ([^>]*)\s*(["|\']{1}\w*)\s*nofollow([^>]*)>~U',
 '<a ${1}${2}${3}>', $str);
 return str_replace(array(' rel=""', " rel=''"), '', $str);
}
remove_filter('pre_comment_content', 'wp_rel_nofollow');
add_filter ('get_comment_author_link', 'xwp_dofollow');
add_filter ('post_comments_link', 'xwp_dofollow');
add_filter ('comment_reply_link', 'xwp_dofollow');
add_filter ('comment_text', 'xwp_dofollow');

23、给评论添加垃圾，删除按钮

// spam & delete links for all versions of wordpress
function delete_comment_link($id) {
 if (current_user_can('edit_post')) {
 echo '| <a href="'.get_bloginfo('wpurl').'/wp-admin/comment.php?action=cdc&c='.$id.'">删除评论</a> ';
 echo '| <a href="'.get_bloginfo('wpurl').'/wp-admin/comment.php?action=cdc&dt=spam&c='.$id.'">垃圾评论</a>';
 }
}

24、彻底禁用WordPress的rss功能

// disable all feeds
function fb_disable_feed() {
 wp_die(__('<h1>本站不提供RSS阅读服务，请<a href="'.get_bloginfo('url').'">点击此处</a>返回首页</h1>'));
}
add_action('do_feed', 'fb_disable_feed', 1);
add_action('do_feed_rdf', 'fb_disable_feed', 1);
add_action('do_feed_rss', 'fb_disable_feed', 1);
add_action('do_feed_rss2', 'fb_disable_feed', 1);
add_action('do_feed_atom', 'fb_disable_feed', 1);

25、自定义WordPress默认头像

// customize default gravatars
function custom_gravatars($avatar_defaults) {
 
 // change the default gravatar
 $customGravatar1 = get_bloginfo('template_directory').'/images/gravatar-01.png';
 $avatar_defaults[$customGravatar1] = 'Default';
 
 // add a custom user gravatar
 $customGravatar2 = get_bloginfo('template_directory').'/images/gravatar-02.png';
 $avatar_defaults[$customGravatar2] = 'Custom Gravatar';
 
 // add another custom gravatar
 $customGravatar3 = get_bloginfo('template_directory').'/images/gravatar-03.png';
 $avatar_defaults[$customGravatar3] = 'Custom gravatar';
 
 return $avatar_defaults;
}
add_filter('avatar_defaults', 'custom_gravatars');

26、转换评论中的HTML实体

// escape html entities in comments
function encode_code_in_comment($source) {
 $encoded = preg_replace_callback('/<code>(.*?)<\/code>/ims',
 create_function('$matches', '$matches[1] = preg_replace(array("/^[\r|\n]+/i", "/[\r|\n]+$/i"), "", $matches[1]); 
 return "<code>" . htmlentities($matches[1]) . "</"."code>";'), $source);
 if ($encoded)
 return $encoded;
 else
 return $source;
}
add_filter('pre_comment_content', 'encode_code_in_comment');

27、在upload文件夹下新建一个目录

function my_upload_dir()
{
 $upload = wp_upload_dir();
 $upload_dir = $upload['basedir'];
 $upload_dir = $upload_dir . '/mypluginfiles';
 if (!is_dir($upload_dir)) {
 mkdir($upload_dir, 448);
 }
}
register_activation_hook(__FILE__, 'my_upload_dir');

28、去除文章图片自动添加尺寸的问题

add_filter( 'post_thumbnail_html', 'remove_width_attribute', 10 );
add_filter( 'image_send_to_editor', 'remove_width_attribute', 10 );
 
function remove_width_attribute( $html ) {
 $html = preg_replace( '/(width|height)="\d*"\s/', "", $html );
 return $html;
}

29、WordPress后台自定义样式

add_action('admin_head', 'my_custom_fonts');
 
function my_custom_fonts() {
 echo '<style>
 body, td, textarea, input, select {
 font-family: "Lucida Grande";
 font-size: 12px;
 } 
 </style>';
}

30、使用短代码使用bloginfo函数

function digwp_bloginfo_shortcode( $atts ) {
 extract(shortcode_atts(array(
 'key' => '',
 ), $atts));
 return get_bloginfo($key);
}
add_shortcode('bloginfo', 'digwp_bloginfo_shortcode');

31、使用短代码防止WordPress自动格式化

function my_formatter($content) {
 $new_content = '';
 $pattern_full = '{(\[raw\].*?\[/raw\])}is';
 $pattern_contents = '{\[raw\](.*?)\[/raw\]}is';
 $pieces = preg_split($pattern_full, $content, -1, PREG_SPLIT_DELIM_CAPTURE);
 
 foreach ($pieces as $piece) {
 if (preg_match($pattern_contents, $piece, $matches)) {
 $new_content .= $matches[1];
 } else {
 $new_content .= wptexturize(wpautop($piece));
 }
 }
 
 return $new_content;
}
 
remove_filter('the_content', 'wpautop');
remove_filter('the_content', 'wptexturize');
 
add_filter('the_content', 'my_formatter', 99);

32、通过ID获取文章内容

function get_the_content_by_id($post_id) {
 $page_data = get_page($post_id);
 if ($page_data) {
 return $page_data->post_content;
 }
 else return false;
}

33、在控制面板创建一个小工具

// Function that outputs the contents of the dashboard widget
function dashboard_widget_function( $post, $callback_args ) {
 echo "Hello World, this is my first Dashboard Widget!";
}
 
// Function used in the action hook
function add_dashboard_widgets() {
 wp_add_dashboard_widget('dashboard_widget', 'Example Dashboard Widget', 'dashboard_widget_function');
}
 
// Register the new dashboard widget with the 'wp_dashboard_setup' action
add_action('wp_dashboard_setup', 'add_dashboard_widgets' );

34、控制面板创建一个表格小工具

// Function that outputs the contents of the dashboard widget
function dashboard_widget_function( $post, $callback_args ) {
 
//Put your all code here which generate the output of summary box
 
$site_users = get_users();
foreach ( $site_users as $user ) {
 
 echo $user->display_name;
 echo $user->roles[0];
 echo get_edit_user_link( $user->ID );
 
 }
 
}

35、更换控制面板logo

//hook the administrative header output
add_action('admin_head', 'my_custom_logo');
 
function my_custom_logo() {
echo '
 <style type="text/css">
 #header-logo
 {background-image: url('.get_bloginfo('template_directory').'/images/custom-logo.gif) !important; }
 </style>
 ';
}

36、禁用可视化编辑器自动补全标签

//disable wpautop filter
remove_filter ('the_content', 'wpautop');

37、增加减少WordPress用户角色

function wps_add_role() {
 add_role( 'manager', 'Manager', 
 array(
 'read',
 'edit_posts',
 'delete_posts',
 )
 );
}
add_action( 'init', 'wps_add_role' );
 
function wps_remove_role() {
 remove_role( 'editor' );
 remove_role( 'author' );
 remove_role( 'contributor' );
 remove_role( 'subscriber' );
}
add_action( 'init', 'wps_remove_role' );

38、添加图片附件上传时候的默认项

function wps_attachment_display_settings() {
 update_option( 'image_default_align', 'center' );
 update_option( 'image_default_link_type', 'none' );
 update_option( 'image_default_size', 'large' );
}
add_action( 'after_setup_theme', 'wps_attachment_display_settings' );

39、图片上传时候添加自定义尺寸

if ( function_exists( 'add_image_size' ) ) {
 add_image_size( 'new-size', 300, 100, true ); //(cropped)
}
 
add_filter('image_size_names_choose', 'my_image_sizes');
function my_image_sizes($sizes) {
 $addsizes = array(
 "new-size" => __( "自定义尺寸")
 );
 $newsizes = array_merge($sizes, $addsizes);
 return $newsizes;
}

40、更换WordPress默认的用户角色名

function wps_change_role_name() {
 global $wp_roles;
 if ( ! isset( $wp_roles ) )
 $wp_roles = new WP_Roles();
 $wp_roles->roles['contributor']['name'] = 'Owner';
 $wp_roles->role_names['contributor'] = 'Owner'; 
}
add_action('init', 'wps_change_role_name');

41、主题激活后自动创建页面

if (isset($_GET['activated']) && is_admin()){
 
 $new_page_title = 'This is the page title';
 $new_page_content = 'This is the page content';
 $new_page_template = ''; //ex. template-custom.php. Leave blank if you don't want a custom page template.
 
 //don't change the code bellow, unless you know what you're doing
 
 $page_check = get_page_by_title($new_page_title);
 $new_page = array(
 'post_type' => 'page',
 'post_title' => $new_page_title,
 'post_content' => $new_page_content,
 'post_status' => 'publish',
 'post_author' => 1,
 );
 if(!isset($page_check->ID)){
 $new_page_id = wp_insert_post($new_page);
 if(!empty($new_page_template)){
 update_post_meta($new_page_id, '_wp_page_template', $new_page_template);
 }
 }
 
}

42、非管理员不得访问后台

  add_action( 'init', 'blockusers_wps_init' );
 function blockusers_wps_init() {
 if ( is_admin() && ! current_user_can( 'administrator' ) ) {
 wp_redirect( home_url() );//滚回首页吧
 exit;
 }
 }

43、用户注册成功后跳转

function wps_registration_redirect(){
 return home_url( '/finished/' );
}
add_filter( 'registration_redirect', 'wps_registration_redirect' );

44、给自定义文章添加概览计数

add_filter( 'dashboard_glance_items', 'custom_glance_items', 10, 1 );
 
function custom_glance_items( $items = array() ) {
 
 $post_types = array( 'post_type_1', 'post_type_2' );
 
 foreach( $post_types as $type ) {
 
 if( ! post_type_exists( $type ) ) continue;
 
 $num_posts = wp_count_posts( $type );
 
 if( $num_posts ) {
 
 $published = intval( $num_posts->publish );
 $post_type = get_post_type_object( $type );
 
 $text = _n( '%s ' . $post_type->labels->singular_name, '%s ' . $post_type->labels->name, $published, 'your_textdomain' );
 $text = sprintf( $text, number_format_i18n( $published ) );
 
 if ( current_user_can( $post_type->cap->edit_posts ) ) {
 $items[] = sprintf( '%2$s', $type, $text ) . "\n";
 } else {
 $items[] = sprintf( '%2$s', $type, $text ) . "\n";
 }
 }
 }
 
 return $items;
}

#dashboard_right_now a.post_type-count:before,
#dashboard_right_now span.post_type-count:before {
 content: "\f109";
}

45、给可视化编辑器添加短代码

add_action('media_buttons','add_sc_select',11);
function add_sc_select(){
 echo ' <select id="sc_select">
 <option>短代码</option>
 <option value="[html][/html]">[html]</option>
 <option value="[css][/css]">[css[</option>
 <option value="[javascript][/javascript]">[javascript]</option>
 </select>';
}
add_action('admin_head', 'button_js');
function button_js() {
 echo '<script type="text/javascript">
 jQuery(document).ready(function(){
 jQuery("#sc_select").change(function() {
 send_to_editor(jQuery("#sc_select :selected").val());
 return false;
 });
 });
 </script>';
}

46、给文章添加特色图才给发布，否则不给发

add_action('save_post', 'wpds_check_thumbnail');
add_action('admin_notices', 'wpds_thumbnail_error');
 
function wpds_check_thumbnail($post_id) {
 
 // change to any custom post type 
 if(get_post_type($post_id) != 'post')
 return;
 
 if ( !has_post_thumbnail( $post_id ) ) {
 // set a transient to show the users an admin message
 set_transient( "has_post_thumbnail", "no" );
 // unhook this function so it doesn't loop infinitely
 remove_action('save_post', 'wpds_check_thumbnail');
 // update the post set it to draft
 wp_update_post(array('ID' => $post_id, 'post_status' => 'draft'));
 
 add_action('save_post', 'wpds_check_thumbnail');
 } else {
 delete_transient( "has_post_thumbnail" );
 }
}
 
function wpds_thumbnail_error()
{
 // check if the transient is set, and display the error message
 if ( get_transient( "has_post_thumbnail" ) == "no" ) {
 echo "<div id='message' class='error'><p><strong>您必须选择一个特色图片，您的文章现已被保存，但是无法发布。</strong></p></div>";
 delete_transient( "has_post_thumbnail" );
 }
 
}

47、要求评论字数的最小值

add_filter( 'preprocess_comment', 'minimal_comment_length' );
 
function minimal_comment_length( $commentdata ) {
 $minimalCommentLength = 20;//这里自己改
 
 if ( strlen( trim( $commentdata['comment_content'] ) ) < $minimalCommentLength ){
 wp_die( '评论最起码要有 ' . $minimalCommentLength . ' 个字符哦.' );
 }
 
 return $commentdata;
}

48、用颜色区分后台文章的状态

add_action('admin_footer','posts_status_color');
function posts_status_color(){
?>
<style>
.status-draft{background: #FCE3F2 !important;}
.status-pending{background: #87C5D6 !important;}
.status-publish{/* no background keep wp alternating colors */}
.status-future{background: #C6EBF5 !important;}
.status-private{background:#F2D46F;}
</style>
<?php
}

49、给特定文章/页面强制SSL浏览

function wps_force_ssl( $force_ssl, $post_id = 0, $url = '' ) {
 if ( $post_id == 25 ) {
 return true
 }
 return $force_ssl;
}
 
add_filter('force_ssl' , 'wps_force_ssl', 10, 3);

50、给后台添加指引

add_action( 'admin_enqueue_scripts', 'my_admin_enqueue_scripts' );
function my_admin_enqueue_scripts() {
 wp_enqueue_style( 'wp-pointer' );
 wp_enqueue_script( 'wp-pointer' );
 add_action( 'admin_print_footer_scripts', 'my_admin_print_footer_scripts' );
}
function my_admin_print_footer_scripts() {
 $pointer_content = '<h3>森林之家的通知</h3>';
 $pointer_content .= '<p>这是一个通知</p>';
?>
 <script type="text/javascript">
 //<![CDATA[
 jQuery(document).ready( function($) {
 $('#menu-appearance').pointer({
 content: '<?php echo $pointer_content; ?>',
 position: 'left',
 close: function() {
 // Once the close button is hit
 }
 }).pointer('open');
 });
 //]]>
 </script>
<?php
}

51、给WordPress添加欢迎信息

<?php if( strpos($_SERVER[HTTP_REFERER], "baidu.com" ) == true ): ?>
 <div class="welcome-stumbleupon">
 <p>欢迎来自百度的亲们！</p>
 </div>
<?php endif; ?>

52、角色变换时候发送电子邮件

function user_role_update( $user_id, $new_role ) {
 $site_url = get_bloginfo('wpurl');
 $user_info = get_userdata( $user_id );
 $to = $user_info->user_email; 
 $subject = "Role changed: ".$site_url."";
 $message = "Hello " .$user_info->display_name . " 亲，您在".$site_url.", 角色已经变为 " . $new_role;
 wp_mail($to, $subject, $message);
}
add_action( 'set_user_role', 'user_role_update', 10, 2);

53、短代码添加一个网站的截图

function wps_screenshot($atts, $content = null) {
 extract(shortcode_atts(array(
 "screenshot" => 'http://s.wordpress.com/mshots/v1/',
 "url" => 'http://',
 "alt" => 'screenshot',
 "width" => '400',
 "height" => '300'
 ), $atts));
 return $screen = '<img src="' . $screenshot . '' . urlencode($url) . '?w=' . $width . '&h=' . $height . '" alt="' . $alt . '"/>';
}
add_shortcode("screenshot", "wps_screenshot");

[screenshot url=”https://www.xxx.cn” alt=”wordpress code snippets for your blog” width=”200″ height=”200″]

54、使用短代码添加倒计时功能

function content_countdown($atts, $content = null){
 extract(shortcode_atts(array(
 'month' => '',
 'day' => '',
 'year' => ''
 ), $atts));
 $remain = ceil((mktime( 0,0,0,(int)$month,(int)$day,(int)$year) - time())/86400);
 if( $remain > 1 ){
 return $daysremain = "<div class=\"event\">Just <b>($remain)</b> days until content is available</div>";
 }else if($remain == 1 ){
 return $daysremain = "<div class=\"event\">Just <b>($remain)</b> day until content is available</div>";
 }else{
 return $content;
 }
}
add_shortcode('cdt', 'content_countdown');

[cdt month=”10″ day=”17″ year=”2011″]本次活动已过期，请下次再来！－森林之家[/cdt]

55、强制控制面板显示一列

function single_screen_columns( $columns ) {
 $columns['dashboard'] = 1;
 return $columns;
}
add_filter( 'screen_layout_columns', 'single_screen_columns' );
 
function single_screen_dashboard(){return 1;}
add_filter( 'get_user_option_screen_layout_dashboard', 'single_screen_dashboard' );

56、让登陆用户自己选择登陆后的跳转

// Fields for redirect
function custom_login_fields() {
?>
 <p>
 <label>
 <strong>Choose your location: </strong>
 <select name="login_location">
 <option value="">Select …</option>
 <option value="<?php bloginfo('url'); ?>#banking">Banking</option>
 <option value="<?php bloginfo('url'); ?>#insurance">Insurance</option>
 <option value="<?php echo get_permalink(2); ?>">Securities</option>
 </select>
 </label>
 </p><br/>
<?php
}
 
// Redirect function
function location_redirect() {
 $location = $_POST['login_location'];
 wp_safe_redirect($location);
 exit();
}
 
// Add fields to the login form
add_action('login_form','custom_login_fields');
 
// Make sure the redirect happens only if your fields are submitted
if ( (isset($_GET['action']) && $_GET['action'] != 'logout') || (isset($_POST['login_location']) && !empty($_POST['login_location'])) ) 
 add_filter('login_redirect', 'location_redirect', 10, 3);