WordPRess有很多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好。
将下面代码粘贴到你的functions.php文件：
function basic_wp_seo() {
global $page, $paged, $post;
$default_keywords = 'wordpress, plugins, themes, design, dev, development, security, htaccess, apache, php, sql, html, CSS, jquery, javascript, tutorials'; // customize
$output = '';
// description
$seo_desc = get_post_meta($post->ID, 'mm_seo_desc', true);
$description = get_bloginfo('description', 'display');
$pagedata = get_post($post->ID);
if (is_singular()) {
if (!empty($seo_desc)) {
$content = $seo_desc;
} else if (!empty($pagedata)) {
$content = apply_filters('the_excerpt_rss', $pagedata->post_content);
$content = substr(trim(strip_tags($content)), 0, 155);
$content = preg_replace('#\n#', ' ', $content);
$content = preg_replace('#\s{2,}#', ' ', $content);
$content = trim($content);
}
} else {
$content = $description;
}
$output .= '<meta name="description" content="' . esc_attr($content) . '">' . "\n";
// keywords
$keys = get_post_meta($post->ID, 'mm_seo_keywords', true);
$cats = get_the_category();
$tags = get_the_tags();
if (empty($keys)) {
if (!empty($cats)) foreach($cats as $cat) $keys .= $cat->name . ', ';
if (!empty($tags)) foreach($tags as $tag) $keys .= $tag->name . ', ';
$keys .= $default_keywords;
}
$output .= "\t\t" . '<meta name="keywords" content="' . esc_attr($keys) . '">' . "\n";
// robots
if (is_category() || is_tag()) {
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
if ($paged > 1) {
$output .= "\t\t" . '<meta name="robots" content="noindex,follow">' . "\n";
} else {
$output .= "\t\t" . '<meta name="robots" content="index,follow">' . "\n";
}
} else if (is_home() || is_singular()) {
$output .= "\t\t" . '<meta name="robots" content="index,follow">' . "\n";
} else {
$output .= "\t\t" . '<meta name="robots" content="noindex,follow">' . "\n";
}
// title
$title_custom = get_post_meta($post->ID, 'mm_seo_title', true);
$url = ltrim(esc_url($_SERVER['REQUEST_URI']), '/');
$name = get_bloginfo('name', 'display');
$title = trim(wp_title('', false));
$cat = single_cat_title('', false);
$tag = single_tag_title('', false);
$search = get_search_query();
if (!empty($title_custom)) $title = $title_custom;
if ($paged >= 2 || $page >= 2) $page_number = ' | ' . sprintf('Page %s', max($paged, $page));
else $page_number = '';
if (is_home() || is_front_page()) $seo_title = $name . ' | ' . $description;
elseif (is_singular()) $seo_title = $title . ' | ' . $name;
elseif (is_tag()) $seo_title = 'Tag Archive: ' . $tag . ' | ' . $name;
elseif (is_category()) $seo_title = 'Category Archive: ' . $cat . ' | ' . $name;
elseif (is_archive()) $seo_title = 'Archive: ' . $title . ' | ' . $name;
elseif (is_search()) $seo_title = 'Search: ' . $search . ' | ' . $name;
elseif (is_404()) $seo_title = '404 - Not Found: ' . $url . ' | ' . $name;
else $seo_title = $name . ' | ' . $description;
$output .= "\t\t" . '<title>' . esc_attr($seo_title . $page_number) . '</title>' . "\n";
return $output;
}
需修改一下$default_keywords 后面默认的关键字
使用方法：用下面代码：
<?php echo basic_wp_seo(); ?>
替换主题header.php模板
<title></title>
注：可能不同的主题有所区别。
文章来源：http://zmingcx.com/non-plug-in-for-efficient-seo-optimization.html