Adding 'Keywords' and 'description' for wordpress site
A lightweight way to add SEO meta keywords and descriptions in WordPress without heavy plugins—using a small `functions.php` hook that derives values from content, tags, and categories.
Most WordPress themes do not provide keywords and description tags. That can be a problem when optimizing SEO. Of course, there are many plugins for solving this issue. However, not all servers are comfortable with those plugins. Some high-ranked SEO plugins may work perfectly on servers with high-standard configurations and features, but they are disasters for small personal servers. It can be a serious problem to load a plugin consuming hundreds of megabytes on a small server with 1 gigabyte for instance. At the worst case, the website may not be loaded eventually.
So if you only want to add those meta tags in your website with no need of monitoring the traffic statistics, here is a more efficient way for your references.
Implementation
Adding the following code to functions.php located in your child theme will do the job
and you are off to go.
function meta_seo() {
$description = "some description for homepage, default for other pages";
$keywords = "some keywords for homepage, default for other pages";
if ( is_single() ) {
global $post;
$meta_description = get_post_meta($post->ID, "description", true);
if ( $meta_description ) {
$description = $meta_description;
} else {
$description =
str_replace(PHP_EOL, "",
mb_strimwidth(
strip_tags($post->post_content) , 0, 100, "…", 'utf-8'
)
);
}
$meta_keywords = get_post_meta($post->ID, "keywords", true);
if ( $meta_keywords ) {
$keywords .= "," . $meta_keywords;
} else {
$tags = wp_get_post_tags($post->ID);
foreach ($tags as $tag) {
$keywords .= "," . $tag->name;
}
}
}
elseif ( is_category() ) {
$keywords .= "," . single_cat_title('', false);
}
elseif ( is_tag() ) {
$keywords .= "," . single_tag_title('', false);
}
$description = rtrim(strip_tags($description), ", ");
$keywords = rtrim(strip_tags($keywords), ", ");
echo
'<meta name="keywords" content="' . $keywords . '" />' .
'<meta name="description" content="' . $description . '" />';
}
add_action('wp_head', 'meta_seo');