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' |
03 |
register_sidebar(array( |
04 |
'name' |
05 |
'before_widget' |
06 |
'after_widget' |
07 |
'before_title' |
08 |
'after_title' |
09 |
)); |
10 |
register_sidebar(array( |
11 |
'name' |
12 |
'before_widget' |
13 |
'after_widget' |
14 |
'before_title' |
15 |
'after_title' |
16 |
)); |
17 |
register_sidebar(array( |
18 |
'name' |
19 |
'before_widget' |
20 |
'after_widget' |
21 |
'before_title' |
22 |
'after_title' |
23 |
)); |
24 |
register_sidebar(array( |
25 |
'name' |
26 |
'before_widget' |
27 |
'after_widget' |
28 |
'before_title' |
29 |
'after_title' |
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' |
03 |
register_nav_menus( |
04 |
array( |
05 |
'header-menu' |
06 |
'footer-menu' |
07 |
'sider-menu' |
08 |
'primary' |
09 |
) |
10 |
); |
11 |
} |
输出菜单，在如header.php插入显示菜单的代码
1 |
|
3. 面包屑导航
01 |
// 面包屑导航注册代码 |
02 |
function wheatv_breadcrumbs() { |
03 |
$delimiter = '>' |
04 |
$name = '首页' |
05 |
$currentBefore = '' |
06 |
$currentAfter = '' |
07 |
|
08 |
if ( !is_home() && !is_front_page() || is_paged() ) { |
09 |
|
10 |
echo '' |
11 |
global $post; |
12 |
// $home = get_bloginfo('url'); |
13 |
$home = get_option('home' |
14 |
echo ' |
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, ' ' |
23 |
echo $currentBefore . '' |
24 |
single_cat_title(); |
25 |
echo '' |
26 |
|
27 |
} elseif ( is_day() ) { |
28 |
echo '' |
29 |
echo '' |
30 |
echo $currentBefore . get_the_time('d' |
31 |
|
32 |
} elseif ( is_month() ) { |
33 |
echo '' |
34 |
echo $currentBefore . get_the_time('F' |
35 |
|
36 |
} elseif ( is_year() ) { |
37 |
echo $currentBefore . get_the_time('Y' |
38 |
|
39 |
} elseif ( is_single() ) { |
40 |
$cat = get_the_category(); $cat = $cat[0]; |
41 |
echo get_category_parents($cat, TRUE, ' ' |
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[] = '' |
57 |
$parent_id = $page->post_parent; |
58 |
} |
59 |
$breadcrumbs = array_reverse($breadcrumbs); |
60 |
foreach ($breadcrumbs as $crumb) echo $crumb . ' ' |
61 |
echo $currentBefore; |
62 |
the_title(); |
63 |
echo $currentAfter; |
64 |
|
65 |
} elseif ( is_search() ) { |
66 |
echo $currentBefore . '搜索结果' |
67 |
|
68 |
} elseif ( is_tag() ) { |
69 |
echo $currentBefore . '搜索标签： ' |
70 |
single_tag_title(); |
71 |
echo '' |
72 |
|
73 |
} elseif ( is_author() ) { |
74 |
global $author; |
75 |
$userdata = get_userdata($author); |
76 |
echo $currentBefore . 'Articles posted by ' |
77 |
|
78 |
} elseif ( is_404() ) { |
79 |
echo $currentBefore . 'Error 404' |
80 |
} |
81 |
|
82 |
if ( get_query_var('paged' |
83 |
if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ' (' |
84 |
echo __('第' |
85 |
if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ')' |
86 |
} |
87 |
echo '' |
88 |
} |
89 |
} |
显示面包屑导航（category.php或single.php等）
1 |
|
4. 文章访问量（点击数）
wordpress二次开发技巧之functions.php篇
01 |
//文章点击数 |
02 |
function getPostViews($postID){ |
03 |
$count_key = 'post_views_count' |
04 |
$count = get_post_meta($postID, $count_key, true); |
05 |
if($count=='' |
06 |
delete_post_meta($postID, $count_key); |
07 |
add_post_meta($postID, $count_key, '0' |
08 |
return "0"; |
09 |
} |
10 |
return $count; |
11 |
} |
12 |
function setPostViews($postID) { |
13 |
$count_key = 'post_views_count' |
14 |
$count = get_post_meta($postID, $count_key, true); |
15 |
if($count=='' |
16 |
$count = 0; |
17 |
delete_post_meta($postID, $count_key); |
18 |
add_post_meta($postID, $count_key, '0' |
19 |
}else{ |
20 |
$count++; |
21 |
update_post_meta($postID, $count_key, $count); |
22 |
} |
23 |
} |
显示点击量（如category.php或single.php）
1 |
|
5. 文章中所有链接新窗口中打开
1 |
//为文章中所有链接添加target="_blank"属性 |
2 |
function autoblank($content) { |
3 |
$content = preg_replace("/, "">", $content); |
4 |
return $content; |
5 |
} |
6 |
add_filter('the_content' |
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' |
04 |
remove_action( 'wp_head' |
05 |
remove_action( 'wp_head' |
06 |
remove_action( 'wp_head' |
07 |
remove_action( 'wp_head' |
08 |
remove_action( 'wp_head' |
09 |
remove_action( 'wp_head' |
10 |
remove_action( 'wp_head' |
11 |
//remove_action( 'wp_head', 'locale_stylesheet' ); |
12 |
remove_action( 'publish_future_post' |
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' |
17 |
//remove_action( 'wp_head', 'rel_canonical' ); |
18 |
remove_action( 'wp_footer' |
19 |
remove_action( 'wp_head' |
20 |
remove_action( 'template_redirect' |
21 |
add_action('widgets_init' |
22 |
function my_remove_recent_comments_style() { |
23 |
global $wp_widget_factory; |
24 |
remove_action('wp_head' |
25 |
} |
7. 自动保存和文章修订功能
wordpress二次开发技巧之functions.php篇
1 |
//自动保存和文章修订功能 |
2 |
define('AUTOSAVE_INTERVAL' |
3 |
define('WP_POST_REVISIONS' |
8. 彩色静态标签云
wordpress二次开发技巧之functions.php篇
01 |
// 彩色静态标签云 Color Tag Cloud |
02 |
function colorCloud($text) { |
03 |
$text = preg_replace_callback('||i' |
04 |
return $text; |
05 |
} |
06 |
function colorCloudCallback($matches) { |
07 |
$text = $matches[1]; |
08 |
$color = dechex(rand(0,16777215)); |
09 |
$pattern = '/style=('|")(.*)('|")/i' |
10 |
$text = preg_replace($pattern, "style="color:#{$color};$2;"", $text); |
11 |
return ""; |
12 |
} |
13 |
add_filter('wp_tag_cloud' |
输出标签
1 |
|
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 |
|
09 |
' |
10 |
} |
11 |
} |
12 |
function lee_init_jquery() { |
13 |
wp_enqueue_script('jquery' |
14 |
} |
15 |
add_action('init' |
16 |
add_action('wp_print_scripts' |
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 ' |
04 |
} |
05 |
add_action('login_head' |
06 |
|
07 |
function login_headerurl($url) { |
08 |
return get_bloginfo('url' |
09 |
} |
10 |
add_filter('login_headerurl' |
11 |
|
12 |
function login_headertitle($title){ |
13 |
return __('轩枫阁' |
14 |
} |
15 |
add_filter('login_headertitle' |
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' |
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.'/' |
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' |
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.'/' |
32 |
echo $output; |
33 |
} |
显示上下篇及位置，在single.php
1 |
|
2 |
|
3 |
|
4 |
|
5 |
|
12. 热门标签ajax加载
点击换一换
wordpress二次开发技巧之functions.php篇
01 |
// 热门标签ajax部分 |
02 |
function tagLoad(){ |
03 |
if( isset($_GET['action' |
04 |
if($_GET['action' |
05 |
echo wp_tag_cloud('smallest=10&largest=14&number=32&order=RAND' |
06 |
die; |
07 |
} |
08 |
} |
09 |
|
10 |
} |
11 |
add_action('init' |
HTML部分
1 |
|
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' |
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 |
$regexp = "??)([^" >]*?)1[^>]*>"; |
06 |
if(preg_match_all("/$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 $content; |
41 |
|
42 |
} |
14. 图片懒加载lazyload3. 外链加上nofollow
1 |
function lazyload($content) { |
2 |
if(!is_feed()||!is_robots) { |
3 |
$content=preg_replace('/ |
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 $fullimage; |
14 |
} |
15 |
add_shortcode("postimage", "wpdx_postimage"); |
显示图片
16. 截取摘要
wordpress二次开发技巧之functions.php篇
01 |
// 摘要字数限制 |
02 |
function new_excerpt_length($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 '.get_category_link($category[0]->term_id ).'">'.$category[0]->cat_name.''; |
6 |
} |
7 |
} |
8 |
add_filter('get_first_category', 'get_first_category'); |
HTML
1 |
|
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, '. get_permalink() .'"> [...]' ); |
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 '.get_permalink().'" title="阅读全文">'; |
17 |
|
18 |
the_post_thumbnail('thumbnail'); |
19 |
|
20 |
echo ''; |
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('/ |
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 '.get_permalink().'" title="阅读全文">$thumb_src.'" alt="缩略图" />'; |
40 |
|
41 |
}else { // 如果文章内没有图片，则用默认的图片。 |
42 |
$random= mt_rand(0, 19); |
43 |
echo '.get_permalink().'" title="阅读全文">'template_url').'/images/thumbnail/default_thumbnail_'.$random.'.jpg" alt="缩略图" />'; |
44 |
|
45 |
} |
46 |
|
47 |
} |
48 |
|
49 |
} |
显示缩略图
1 |
// 第一种 |
2 |
|
3 |
|
4 |
5 |
// 第二种 |
6 |
|