非插件完成高效的SEO优化

WordPress有许多SEO插件来帮助进行搜索引擎优化。如果你不想使用插件，下面这个高效的代码，将使你的博客对搜索引擎更加友爱。

将下面代码张贴到你的functions.php文件：

1. function basic_wp_seo() {
2. global $page, $paged, $post;
3. $default_keywords = 'wordpress, plugins, themes, design, dev, development, security, htaccess, apache, php, sql, html, css, jquery, javascript, tutorials'; // customize
4. $output = '';
6. // description
7. $seo_desc = get_post_meta($post->ID, 'mm_seo_desc', true);
8. $description = get_bloginfo('description', 'display');
9. $pagedata = get_post($post->ID);
10. if (is_singular()) {
11. if (!empty($seo_desc)) {
12. $content = $seo_desc;
13. } else if (!empty($pagedata)) {
14. $content = apply_filters('the_excerpt_rss', $pagedata->post_content);
15. $content = substr(trim(strip_tags($content)), 0, 155);
16. $content = preg_replace('#\n#', ' ', $content);
17. $content = preg_replace('#\s{2,}#', ' ', $content);
18. $content = trim($content);
19. }
20. } else {
21. $content = $description;
22. }
23. $output .= '<meta name="description" content="' . esc_attr($content) . '">' . "\n";
25. // keywords
26. $keys = get_post_meta($post->ID, 'mm_seo_keywords', true);
27. $cats = get_the_category();
28. $tags = get_the_tags();
29. if (empty($keys)) {
30. if (!empty($cats)) foreach($cats as $cat) $keys .= $cat->name . ', ';
31. if (!empty($tags)) foreach($tags as $tag) $keys .= $tag->name . ', ';
32. $keys .= $default_keywords;
33. }
34. $output .= "\t\t" . '<meta name="keywords" content="' . esc_attr($keys) . '">' . "\n";
36. // robots
37. if (is_category() || is_tag()) {
38. $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
39. if ($paged > 1) {
40. $output .= "\t\t" . '<meta name="robots" content="noindex,follow">' . "\n";
41. } else {
42. $output .= "\t\t" . '<meta name="robots" content="index,follow">' . "\n";
43. }
44. } else if (is_home() || is_singular()) {
45. $output .= "\t\t" . '<meta name="robots" content="index,follow">' . "\n";
46. } else {
47. $output .= "\t\t" . '<meta name="robots" content="noindex,follow">' . "\n";
48. }
50. // title
51. $title_custom = get_post_meta($post->ID, 'mm_seo_title', true);
52. $url = ltrim(esc_url($_SERVER['REQUEST_URI']), '/');
53. $name = get_bloginfo('name', 'display');
54. $title = trim(wp_title('', false));
55. $cat = single_cat_title('', false);
56. $tag = single_tag_title('', false);
57. $search = get_search_query();
59. if (!empty($title_custom)) $title = $title_custom;
60. if ($paged >= 2 || $page >= 2) $page_number = ' | ' . sprintf('Page %s', max($paged, $page));
61. else $page_number = '';
63. if (is_home() || is_front_page()) $seo_title = $name . ' | ' . $description;
64. elseif (is_singular()) $seo_title = $title . ' | ' . $name;
65. elseif (is_tag()) $seo_title = 'Tag Archive: ' . $tag . ' | ' . $name;
66. elseif (is_category()) $seo_title = 'Category Archive: ' . $cat . ' | ' . $name;
67. elseif (is_archive()) $seo_title = 'Archive: ' . $title . ' | ' . $name;
68. elseif (is_search()) $seo_title = 'Search: ' . $search . ' | ' . $name;
69. elseif (is_404()) $seo_title = '404 - Not Found: ' . $url . ' | ' . $name;
70. else $seo_title = $name . ' | ' . $description;
72. $output .= "\t\t" . '<title>' . esc_attr($seo_title . $page_number) . '</title>' . "\n";
74. return $output;
75. }