wordpress二次开发中对于functions.php的制作是非常多的，今天我们来分享关于wordpress二次开发技巧之functions.php的制作，希望大家可以喜欢！
下面根据需求，对各种能实现进行简单介绍。
先对functions.php文件进行介绍，通过代码实现各功能。
1. widgets sidebar 侧边栏小工具
wordpress二次开发技巧之functions.php篇
01 /** widgets sidebar 侧边栏小工具*/
02 if( function_exists('register_sidebar'<span class="crayon-sy">) ) {
03 register_sidebar(array(
04 'name' <span class="crayon-o">=> 'First_sidebar'<span class="crayon-sy">,
05 'before_widget' <span class="crayon-o">=> ''<span class="crayon-sy">,
06 'after_widget' <span class="crayon-o">=> ''<span class="crayon-sy">,
07 'before_title' <span class="crayon-o">=> '<h4>'<span class="crayon-sy">,
08 'after_title' <span class="crayon-o">=> '</h4>'
09 ));
10 register_sidebar(array(
11 'name' <span class="crayon-o">=> 'Second_sidebar'<span class="crayon-sy">,
12 'before_widget' <span class="crayon-o">=> ''<span class="crayon-sy">,
13 'after_widget' <span class="crayon-o">=> ''<span class="crayon-sy">,
14 'before_title' <span class="crayon-o">=> '<h4>'<span class="crayon-sy">,
15 'after_title' <span class="crayon-o">=> '</h4>'
16 ));
17 register_sidebar(array(
18 'name' <span class="crayon-o">=> 'Third_sidebar'<span class="crayon-sy">,
19 'before_widget' <span class="crayon-o">=> ''<span class="crayon-sy">,
20 'after_widget' <span class="crayon-o">=> ''<span class="crayon-sy">,
21 'before_title' <span class="crayon-o">=> '<h4>'<span class="crayon-sy">,
22 'after_title' <span class="crayon-o">=> '</h4>'
23 ));
24 register_sidebar(array(
25 'name' <span class="crayon-o">=> 'Fourth_sidebar'<span class="crayon-sy">,
26 'before_widget' <span class="crayon-o">=> ''<span class="crayon-sy">,
27 'after_widget' <span class="crayon-o">=> ''<span class="crayon-sy">,
28 'before_title' <span class="crayon-o">=> '<h4>'<span class="crayon-sy">,
29 'after_title' <span class="crayon-o">=> '</h4>'
30 ));
31 }
32
33 register_nav_menus(array("primary" => "Primary Navigation"));2. 后台支持自定义菜单
wordpress二次开发技巧之functions.php篇
01 /*nav 后台自定义菜单*/
02 if(function_exists('register_nav_menus'<span class="crayon-sy">)){
03 register_nav_menus(
04 array(
05 'header-menu' <span class="crayon-o">=> __( '导航自定义菜单' <span class="crayon-sy">),
06 'footer-menu' <span class="crayon-o">=> __( '页角自定义菜单' <span class="crayon-sy">),
07 'sider-menu' <span class="crayon-o">=> __('侧边栏菜单'<span class="crayon-sy">),
08 'primary' <span class="crayon-o">=> __( 'Primary Navigation'<span class="crayon-sy">, 'lee' <span class="crayon-sy">),
09 )
10 );
11输出菜单，在如header.php插入显示菜单的代码
1 <?php wp_nav_menu( array( 'container' <span class="crayon-o">=> '' <span class="crayon-sy">) ); ?>
3. 面包屑导航
01 // 面包屑导航注册代码
02 function wheatv_breadcrumbs() {
03 $delimiter = '<i>></i>'<span class="crayon-sy">;
04 $name = '首页'<span class="crayon-sy">; //text for the 'Home' link
05 $currentBefore = ''<span class="crayon-sy">;
06 $currentAfter = ''<span class="crayon-sy">;
07
08 if ( !is_home() && !is_front_page() || is_paged() ) {
09
10 echo ''<span class="crayon-sy">;
11 global $post;
12 // $home = get_bloginfo('url');
13 $home = get_option('home'<span class="crayon-sy">);
14 echo '<a href="'<span class="crayon-sy">.$home.'" >'<span class="crayon-sy">. $name . ' </a>' <span class="crayon-sy">. $delimiter . ' '<span class="crayon-sy">;
15
16 if ( is_category() ) {
17 global $wp_query;
18 $cat_obj = $wp_query->get_queried_object();
19 $thisCat = $cat_obj->term_id;
20 $thisCat = get_category($thisCat);
21 $parentCat = get_category($thisCat->parent);
22 if ($thisCat->parent != 0) echo(get_category_parents($parentCat, TRUE, ' ' <span class="crayon-sy">. $delimiter . ' '<span class="crayon-sy">));
23 echo $currentBefore . ''<span class="crayon-sy">;
24 single_cat_title();
25 echo '' <span class="crayon-sy">. $currentAfter;
26
27 } elseif ( is_day() ) {
28 echo '' <span class="crayon-sy">. get_the_time('Y'<span class="crayon-sy">) .' ' <span class="crayon-sy">. $delimiter . ' '<span class="crayon-sy">;
29 echo '' <span class="crayon-sy">. get_the_time('F'<span class="crayon-sy">) .' ' <span class="crayon-sy">. $delimiter . ' '<span class="crayon-sy">;
30 echo $currentBefore . get_the_time('d'<span class="crayon-sy">) . $currentAfter;
31
32 } elseif ( is_month() ) {
33 echo '' <span class="crayon-sy">. get_the_time('Y'<span class="crayon-sy">) .' ' <span class="crayon-sy">. $delimiter . ' '<span class="crayon-sy">;
34 echo $currentBefore . get_the_time('F'<span class="crayon-sy">) . $currentAfter;
35
36 } elseif ( is_year() ) {
37 echo $currentBefore . get_the_time('Y'<span class="crayon-sy">) . $currentAfter;
38
39 } elseif ( is_single() ) {
40 $cat = get_the_category(); $cat = $cat[0];
41 echo get_category_parents($cat, TRUE, ' ' <span class="crayon-sy">. $delimiter . ' '<span class="crayon-sy">);
42 echo $currentBefore;
43 the_title();
44 echo $currentAfter;
45
46 } elseif ( is_page() && !$post->post_parent ) {
47 echo $currentBefore;
48 the_title();
49 echo $currentAfter;
50
51 } elseif ( is_page() && $post->post_parent ) {
52 $parent_id = $post->post_parent;
53 $breadcrumbs = array();
54 while ($parent_id) {
55 $page = get_page($parent_id);
56 $breadcrumbs[] = '' <span class="crayon-sy">. get_the_title($page->ID) .''<span class="crayon-sy">;
57 $parent_id = $page->post_parent;
58 }
59 $breadcrumbs = array_reverse($breadcrumbs);
60 foreach ($breadcrumbs as $crumb) echo $crumb . ' ' <span class="crayon-sy">.$delimiter . ' '<span class="crayon-sy">;
61 echo $currentBefore;
62 the_title();
63 echo $currentAfter;
64
65 } elseif ( is_search() ) {
66 echo $currentBefore . '搜索结果' <span class="crayon-sy">. get_search_query() . '' <span class="crayon-sy">. $currentAfter;
67
68 } elseif ( is_tag() ) {
69 echo $currentBefore . '搜索标签： '<span class="crayon-sy">;
70 single_tag_title();
71 echo '' <span class="crayon-sy">. $currentAfter;
72
73 } elseif ( is_author() ) {
74 global $author;
75 $userdata = get_userdata($author);
76 echo $currentBefore . 'Articles posted by ' <span class="crayon-sy">. $userdata->display_name . $currentAfter;
77
78 } elseif ( is_404() ) {
79 echo $currentBefore . 'Error 404' <span class="crayon-sy">. $currentAfter;
80 }
81
82 if ( get_query_var('paged'<span class="crayon-sy">) ) {
83 if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ' ('<span class="crayon-sy">;
84 echo __('第'<span class="crayon-sy">) . '' <span class="crayon-sy">. get_query_var('paged'<span class="crayon-sy">) . '页'<span class="crayon-sy">;
85 if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ')'<span class="crayon-sy">;
86 }
87 echo ''<span class="crayon-sy">;
88 }
89显示面包屑导航（category.php或single.php等）
1 <?php wheatv_breadcrumbs(); ?>
4. 文章访问量（点击数）
wordpress二次开发技巧之functions.php篇
01 //文章点击数
02 function getPostViews($postID){
03 $count_key = 'post_views_count'<span class="crayon-sy">;
04 $count = get_post_meta($postID, $count_key, true);
05 if($count==''<span class="crayon-sy">){
06 delete_post_meta($postID, $count_key);
07 add_post_meta($postID, $count_key, '0'<span class="crayon-sy">);
08 return "0";
09 }
10 return $count;
11 }
12 function setPostViews($postID) {
13 $count_key = 'post_views_count'<span class="crayon-sy">;
14 $count = get_post_meta($postID, $count_key, true);
15 if($count==''<span class="crayon-sy">){
16 $count = 0;
17 delete_post_meta($postID, $count_key);
18 add_post_meta($postID, $count_key, '0'<span class="crayon-sy">);
19 }else{
20 $count++;
21 update_post_meta($postID, $count_key, $count);
22 }
23显示点击量（如category.php或single.php）
1 <?php echo getPostViews(get_the_ID()); ?>
5. 文章中所有链接新窗口中打开
1 //为文章中所有链接添加target="_blank"属性
2 function autoblank($content) {
3 $content = preg_replace("/<a(.*?)>/", "<a$1 target="_blank">", $content);
4 return $content;
5 }
6 add_filter('the_content'<span class="crayon-sy">, 'autoblank'<span class="crayon-sy">);6. 清除wp自带无用头部信息
01 //清除头部信息
02 //remove_action( 'wp_head', 'wp_enqueue_scripts', 1 );
03 remove_action( 'wp_head'<span class="crayon-sy">, 'feed_links'<span class="crayon-sy">, 2 );
04 remove_action( 'wp_head'<span class="crayon-sy">, 'feed_links_extra'<span class="crayon-sy">, 3 );
05 remove_action( 'wp_head'<span class="crayon-sy">, 'rsd_link' <span class="crayon-sy">);
06 remove_action( 'wp_head'<span class="crayon-sy">, 'wlwmanifest_link' <span class="crayon-sy">);
07 remove_action( 'wp_head'<span class="crayon-sy">, 'index_rel_link' <span class="crayon-sy">);
08 remove_action( 'wp_head'<span class="crayon-sy">, 'parent_post_rel_link'<span class="crayon-sy">, 10, 0 );
09 remove_action( 'wp_head'<span class="crayon-sy">, 'start_post_rel_link'<span class="crayon-sy">, 10, 0 );
10 remove_action( 'wp_head'<span class="crayon-sy">, 'adjacent_posts_rel_link_wp_head'<span class="crayon-sy">, 10, 0 );
11 //remove_action( 'wp_head', 'locale_stylesheet' );
12 remove_action( 'publish_future_post'<span class="crayon-sy">, 'check_and_publish_future_post'<span class="crayon-sy">, 10, 1 );
13 //remove_action( 'wp_head', 'noindex', 1 );
14 //remove_action( 'wp_head', 'wp_print_styles', 8 );
15 //remove_action( 'wp_head', 'wp_print_head_scripts', 9 );
16 remove_action( 'wp_head'<span class="crayon-sy">, 'wp_generator' <span class="crayon-sy">);
17 //remove_action( 'wp_head', 'rel_canonical' );
18 remove_action( 'wp_footer'<span class="crayon-sy">, 'wp_print_footer_scripts' <spanclass="crayon-sy">);
19 remove_action( 'wp_head'<span class="crayon-sy">, 'wp_shortlink_wp_head'<span class="crayon-sy">, 10, 0 );
20 remove_action( 'template_redirect'<span class="crayon-sy">, 'wp_shortlink_header'<span class="crayon-sy">, 11, 0 );
21 add_action('widgets_init'<span class="crayon-sy">, 'my_remove_recent_comments_style'<span class="crayon-sy">);
22 function my_remove_recent_comments_style() {
23 global $wp_widget_factory;
24 remove_action('wp_head'<span class="crayon-sy">, array($wp_widget_factory->widgets['WP_Widget_Recent_Comments'<span class="crayon-sy">], 'recent_comments_style'<span class="crayon-sy">));
257. 自动保存和文章修订功能
wordpress二次开发技巧之functions.php篇
1 //自动保存和文章修订功能
2 define('AUTOSAVE_INTERVAL'<span class="crayon-sy">, 120 ); // 设置自动保存间隔，单位是秒，默认60
3 define('WP_POST_REVISIONS'<span class="crayon-sy">, false); // 如果不禁用自动修订，最多允许保存的版本数，3表示最多保存3个修订版8. 彩色静态标签云
wordpress二次开发技巧之functions.php篇
01 // 彩色静态标签云 Color Tag Cloud
02 function colorCloud($text) {
03 $text = preg_replace_callback('|<a (.+?)>|i'<span class="crayon-sy">, 'colorCloudCallback'<span class="crayon-sy">, $text);
04 return $text;
05 }
06 function colorCloudCallback($matches) {
07 $text = $matches[1];
08 $color = dechex(rand(0,16777215));
09 $pattern = '/style=('|")(.*)('|")/i'<span class="crayon-sy">;
10 $text = preg_replace($pattern, "style="color:#{$color};$2;"", $text);
11 return "<a $text>";
12 }
13 add_filter('wp_tag_cloud'<span class="crayon-sy">, 'colorCloud'<span class="crayon-sy">, 1);输出标签
1 <?php wp_tag_cloud('smallest=10&largest=14&number=32&order=RAND'<span class="crayon-sy">) ?>9. 搜索结果关键词高亮显示
具体实现，再另写文章介绍，后续可通过搜索找到。
wordpress二次开发技巧之functions.php篇
01 // 搜索结果关键词高亮显示
02 function lee_set_query() {
03 $query = attribute_escape(get_search_query());
04 if(strlen($query) > 0){
05 echo '
06 <script type="text/javascript">
07 var lee_query = "'.$query.'";
08 </script>
09 '<span class="crayon-sy">;
10 }
11 }
12 function lee_init_jquery() {
13 wp_enqueue_script('jquery'<span class="crayon-sy">);
14 }
15 add_action('init'<span class="crayon-sy">, 'lee_init_jquery'<span class="crayon-sy">);
16 add_action('wp_print_scripts'<span class="crayon-sy">, 'lee_set_query'<span class="crayon-sy">);10. 自定义登录界面
在不更改html的情况下，可通过引入样式文件，自定义登录界面。
wordpress二次开发技巧之functions.php篇
01 // 自定义登录界面
02 function custom_login(){
03 echo '<link rel="stylesheet" type="text/css" href="' <span class="crayon-sy">. get_bloginfo('template_directory'<span class="crayon-sy">) . '/css/login.css" />'<span class="crayon-sy">;
04 }
05 add_action('login_head'<span class="crayon-sy">, 'custom_login'<span class="crayon-sy">);
06
07 function login_headerurl($url) {
08 return get_bloginfo('url'<span class="crayon-sy">);
09 }
10 add_filter('login_headerurl'<span class="crayon-sy">, 'login_headerurl'<span class="crayon-sy">);
11
12 function login_headertitle($title){
13 return __('轩枫阁'<span class="crayon-sy">);
14 }
15 add_filter('login_headertitle'<span class="crayon-sy">, 'login_headertitle'<span class="crayon-sy">);11. 获得当前文章的位置
wordpress二次开发技巧之functions.php篇
wordpress二次开发技巧之functions.php篇
01 // 当前文章
02 function num_Pcurrent_post() {
03 global $wpdb;
04 $postid = get_the_ID();//获取当前文章的ID
05 $getpost = get_post($postid);
06 $daysago = $getpost->post_date;//获取当前文章的发布时间
07 $today = gmdate('Y-m-d H:i:s'<span class="crayon-sy">, time() + 3600 * 8);//获取当前服务器的时间
08 $count_posts = wp_count_posts();
09 $num_all_posts = $count_posts->publish;//总的文章数量
10 $result = $wpdb->get_results("SELECT ID FROM $wpdb->posts WHERE post_date BETWEEN '$daysago' AND '$today' AND post_status='publish' AND post_type='post' ORDER BY post_date DESC ");
11 foreach ($result as $Item) {
12 $post_ID[] = $Item->ID;
13 }
14 $num_current_post = count($post_ID)-1;//当前文章发布以前的文章数量总数
15 $output .= $num_current_post.'/'<span class="crayon-sy">.$num_all_posts;
16 echo $output;
17 }
18 function num_Ncurrent_post() {
19 global $wpdb;
20 $postid = get_the_ID();//获取当前文章的ID
21 $getpost = get_post($postid);
22 $daysago = $getpost->post_date;//获取当前文章的发布时间
23 $today = gmdate('Y-m-d H:i:s'<span class="crayon-sy">, time() + 3600 * 8);//获取当前服务器的时间
24 $count_posts = wp_count_posts();
25 $num_all_posts = $count_posts->publish;//总的文章数量
26 $result = $wpdb->get_results("SELECT ID FROM $wpdb->posts WHERE post_date BETWEEN '$daysago' AND '$today' AND post_status='publish' AND post_type='post' ORDER BY post_date DESC ");
27 foreach ($result as $Item) {
28 $post_ID[] = $Item->ID;
29 }
30 $num_current_post = count($post_ID)+1;//当前文章发布以前的文章数量总数
31 $output .= $num_current_post.'/'<span class="crayon-sy">.$num_all_posts;
32 echo $output;
33显示上下篇及位置，在single.php
1 <?php if (get_next_post()) { echo next_post_link('%link'<span class="crayon-sy">,__( '<span title="上一篇:%title">上一篇</span>'<span class="crayon-sy">, 'lee'<span class="crayon-sy">),$in_same_cat = false,$excluded_categories = '11'<span class="crayon-sy">); } else { echo '<a class="arc_nav_new">已最新</a>'<span class="crayon-sy">; }?>
2 <?php num_Pcurrent_post(); ?>
3
4 <?php num_Ncurrent_post(); ?>
5 <?php if (get_previous_post()) { echo previous_post_link('%link'<span class="crayon-sy">,__( '<span title="下一篇:%title">下一篇</span>'<span class="crayon-sy">, 'lee' <span class="crayon-sy">),$in_same_cat = false,$excluded_categories = '11'<spanclass="crayon-sy">); } else { echo '<a class="arc_nav_new">已最后</a>'<span class="crayon-sy">; }?>12. 热门标签ajax加载
点击换一换
wordpress二次开发技巧之functions.php篇
01 // 热门标签ajax部分
02 function tagLoad(){
03 if( isset($_GET['action'<span class="crayon-sy">])){
04 if($_GET['action'<span class="crayon-sy">] == 'tag'<span class="crayon-h"> ){
05 echo wp_tag_cloud('smallest=10&largest=14&number=32&order=RAND'<span class="crayon-sy">);
06 die;
07 }
08 }
09
10 }
11 add_action('init'<span class="crayon-sy">, 'tagLoad'<span class="crayon-sy">);HTML部分
1 <a class="tag_change" href="<?php echo get_option('home'<span class="crayon-sy">)."/?action=tag"; ?>">换一换</a>使用JS实现点击交互
01 // 标签云ajax
02 $(".tag_change").click(function(){
03 $.ajax({
04 url: $(this).attr("href"),
05 type: 'get'<span class="crayon-sy">,
06 beforeSend: function() {
07 // 可以显示loading
08 },
09 error: function(error) {
10 // 错误处理
11 },
12 success: function(data) {
13 // 成功返回数据，先清空初始标签，装载新数据淡入
14 $(".tag_content").empty().append($(data).fadeIn(200));
15 }
16 });
17 return false;
18 });13. 外链加上nofollow
防止引入的网站有问题，被降权
01 // 文章外部链接加上nofollow
02 add_filter( 'the_content', 'cn_nf_url_parse');
03 function cn_nf_url_parse( $content ) {
04
05 $regexp = "<as[^>]*href=("??)([^" >]*?)1[^>]*>";
06 if(preg_match_all("/$regexp/siU", $content, $matches, PREG_SET_ORDER)) {
07 if( !empty($matches) ) {
08
09 $srcUrl = get_option('siteurl');
10 for ($i=0; $i < count($matches); $i++)
11 {
12
13 $tag = $matches[$i][0];
14 $tag2 = $matches[$i][0];
15 $url = $matches[$i][0];
16
17 $noFollow = '';
18
19 $pattern = '/targets*=s*"s*_blanks*"/';
20 preg_match($pattern, $tag2, $match, PREG_OFFSET_CAPTURE);
21 if( count($match) < 1 )
22 $noFollow .= ' target="_blank" ';
23
24 $pattern = '/rels*=s*"s*[n|d]ofollows*"/';
25 preg_match($pattern, $tag2, $match, PREG_OFFSET_CAPTURE);
26 if( count($match) < 1 )
27 $noFollow .= ' rel="nofollow" ';
28
29 $pos = strpos($url,$srcUrl);
30 if ($pos === false) {
31 $tag = rtrim ($tag,'>');
32 $tag .= $noFollow.'>';
33 $content = str_replace($tag2,$tag,$content);
34 }
35 }
36 }
37 }
38
39 $content = str_replace(']]>', ']]>', $content);
40 return $content;
41
4214. 图片懒加载lazyload3. 外链加上nofollow
1 function lazyload($content) {
2 if(!is_feed()||!is_robots) {
3 $content=preg_replace('/<img(.+)src=['"]([^'"]+)['"](.*)>/i',"<img$1data-original="$2" src="data:image/gif;base64,R0lGODlhAQABAIAAAOHh4QAAACH5BAAAAAAALAAAAAABAAEAQAICRAEAOw=="$3>n",$content);
4 }
5 return $content;
6 }
7 add_filter ('the_content', 'lazyload');JS代码（需引入jquery.lazyload.js）
1 // lazyload
2 $("img").lazyload({
3 effect : "fadeIn",
4 threshold : 100,
5 });15. 获取文章中第一张图
如跑马灯图
wordpress二次开发技巧之functions.php篇
01 // 获取文章中第一张图
02 function wpdx_postimage($atts, $content = null) {
03 extract(shortcode_atts(array(
04 "size" => 'full',
05 "float" => 'none'
06 ), $atts));
07 $images =& get_children( 'post_type=attachment&post_mime_type=image&post_parent='. get_the_id() );
08 foreach( $images as $imageID => $imagePost )
09 $fullimage = wp_get_attachment_image($imageID, $size, false);
10 $imagedata = wp_get_attachment_image_src($imageID, $size, false);
11 $width = ($imagedata[1]+2);
12 $height = ($imagedata[2]+2);
13 return $fullimage;
14 }
15 add_shortcode("postimage", "wpdx_postimage");显示图片
1 <a href="<?php the_permalink(); ?>" target="_blank">
2 <?php echo do_shortcode("[postimage]"); ?>
3 </a>16. 截取摘要
wordpress二次开发技巧之functions.php篇
01 // 摘要字数限制
02 function new_excerpt_length($length) {
03 return 100;
04 }
05 add_filter('excerpt_length', 'new_excerpt_length');
06
07 // 摘要...
08 function new_excerpt_more( $more ) {
09 return '...';
10 }
11 add_filter('excerpt_more', 'new_excerpt_more');17. 获取文章第一个分类目录
因为一篇文章可能属于多个目录，有些地方只需要输出一个
1 // 获取文章第一个分类目录
2 function get_first_category(){
3 $category = get_the_category();
4 if($category[0]){
5 echo '<a class="col_cat" href="'.get_category_link($category[0]->term_id ).'">'.$category[0]->cat_name.'</a>';
6 }
7 }
8 add_filter('get_first_category', 'get_first_category');HTML
1 <?php get_first_category(); ?>18. 分类页获得文章简介
wordpress二次开发技巧之functions.php篇
1 // 获得category简介
2 function get_category_expert($length=240){
3 $content = get_the_content();
4 $trimmed_content = wp_trim_words( $content, $length, '<a href="'. get_permalink() .'"> [...]</a>' );
5 echo $trimmed_content;
6 }
7 add_filter('get_category_expert', 'get_category_expert');19. 根据页面类型指定每页显示的文章数
01 // 根据页面类型指定每页显示的文章数
02 function custom_posts_per_page($query){
03 if(is_home()){
04 $query->set('posts_per_page',9);//首页每页显示8篇文章
05 }
06 if(is_search()){
07 $query->set('posts_per_page',5);//搜索页显示所有匹配的文章，不分页
08 }
09 if(is_archive()){
10 $query->set('posts_per_page',-1);//archive每页显示25篇文章
11 }
12 if(is_tag()){
13 $query->set('posts_per_page',4);//archive每页显示25篇文章
14 }
15 if(is_category()){
16 $query->set('posts_per_page',9);//archive每页显示25篇文章
17 }
18 if(is_category(11)){
19 $query->set('posts_per_page',-1);//archive每页显示25篇文章
20 }
21 }//function
22 //this adds the function above to the 'pre_get_posts' action
23 add_action('pre_get_posts','custom_posts_per_page');20. 缩略图
01 //添加特色缩略图支持
02 if ( function_exists('add_theme_support') )add_theme_support('post-thumbnails');
03
04 /*
05 * 缩略图
06 */
07
08 function dm_the_thumbnail() {
09
10 global $post;
11
12 // 判断该文章是否设置的缩略图，如果有则直接显示
13
14 if ( has_post_thumbnail() ) {
15
16 echo '<a class="at_feature" href="'.get_permalink().'" title="阅读全文">';
17
18 the_post_thumbnail('thumbnail');
19
20 echo '</a>';
21
22 } else { //如果文章没有设置缩略图，则查找文章内是否包含图片
23
24 $content = $post->post_content;
25
26 preg_match_all('/<img.*?(?: |t|r|n)?src=['"]?(.+?)['"]?(?:(?: |t|r|n)+.*?)?>/sim', $content, $strResult, PREG_PATTERN_ORDER);
27
28 $n = count($strResult[1]);
29
30 if($n > 0){ // 如果文章内包含有图片，就用第一张图片做为缩略图
31 // 为了得到第一张图片的215x115尺寸，得用正则替换格式
32 $thumb_first = $strResult[1][0];
33 $thumb_split = strrpos($thumb_first, '.');
34 $thumb_before = substr($thumb_first, 0, $thumb_split);
35 $thumb_after = substr($thumb_first, $thumb_split, strlen($thumb_first));
36 $reg = "/-d*xd*/im";
37 $thumb_before = preg_replace($reg, "", $thumb_before);
38 $thumb_src = $thumb_before.'-215x115'.$thumb_after;
39 echo '<a class="at_feature" href="'.get_permalink().'" title="阅读全文"><img class="animated" src="'.$thumb_src.'" alt="缩略图" /></a>';
40
41 }else { // 如果文章内没有图片，则用默认的图片。
42 $random= mt_rand(0, 19);
43 echo '<a class="at_feature" href="'.get_permalink().'" title="阅读全文"><img class="animated" src="'.get_bloginfo('template_url').'/images/thumbnail/default_thumbnail_'.$random.'.jpg" alt="缩略图" /></a>';
44
45 }
46
47 }
48
49显示缩略图
1 // 第一种
2 <?php if (has_post_thumbnail()){ the_post_thumbnail();} ?>
3
4
5 // 第二种
6 <?php dm_the_thumbnail(); ?>本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
