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;
    }
    $output .= \"tt\" . \'<meta name=\"keywords\" content=\"\' . esc_attr($keys) . \'\">\' . \"n\";
    // robots
    if (is_category() || is_tag()) {
        $paged = (get_query_var(\'paged\')) ? get_query_var(\'paged\') : 1;
        if ($paged > 1) {
            $output .=  \"tt\" . \'<meta name=\"robots\" content=\"noindex,follow\">\' . \"n\";
        } else {
            $output .=  \"tt\" . \'<meta name=\"robots\" content=\"index,follow\">\' . \"n\";
        }
    } else if (is_home() || is_singular()) {
        $output .=  \"tt\" . \'<meta name=\"robots\" content=\"index,follow\">\' . \"n\";
    } else {
        $output .= \"tt\" . \'<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;
    $output .= \"tt\" . \'<title>\' . esc_attr($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

可惜这段SEO代码对中文支持不好

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