Get product category and tag terms as meta keyword in WooCommerce

I have been using below code for using Tags & categories as META Keywords for my wordpress posts.

function wcs_add_meta_keywords() {
global $post;
if ( is_single() ) {
    $cats = get_the_category( $post->ID );
    $tags = get_the_tags( $post->ID );
    $keywords = '';
    foreach ( $cats as $cat ) {
        $keywords .= $cat->cat_name . ", ";
    }
    foreach ( $tags as $tag ) {
        $keywords .= $tag->name . ", ";
    }
    echo '<meta name="keywords" content="' . $keywords . '" />' . "\n";
}}add_action( 'wp_head', 'wcs_add_meta_keywords' , 2 );

and below code for using Product description as META description.

function wcs_add_meta_description_tag() {
global $post;
if ( is_single() ) {
    $meta = strip_tags( $post->post_content );
    $meta = strip_shortcodes( $post->post_content );
    $meta = str_replace( array("\n", "\r", "\t"), ' ', $meta );
    $meta = mb_substr( $meta, 0, 125, 'utf8' );
    echo '<meta name="description" content="' . $meta . '" />' . "\n";
}}add_action( 'wp_head', 'wcs_add_meta_description_tag' , 2 );

But now i want to achieve the same for my products in woocommerce. I have learnt and came to know that woocommerce use taxonomies instead so i tried using get_terms() and product_tag, product_cat in place of get_the_category and get_the_tag. But it does not work.

Can anyone help with the correct usage of the variables for the both codes.

thanks in advance

For WordPress and WooCommerce term taxonomies on single post (or custom post), you can better use wp_get_post_terms(), which allows the "fields" argument to target term "names", so the code will be more compact and efficient:

For both WooCommerce and Wordpress you will use:

add_action( 'wp_head', 'wcs_add_meta_keywords' , 2 );
function wcs_add_meta_keywords() {
    // For WordPress single posts with categories and tags
    if ( is_single() && ! is_product() ) {
        $cats = (array) wp_get_post_terms( get_the_id(), 'category', array('fields' => 'names') );
        $tags = (array) wp_get_post_terms( get_the_id(), 'post_tag', array('fields' => 'names') );
    }
    //  For WooCommerce single product (product categories and product tags)
    elseif ( is_product() ) {
        $cats = (array) wp_get_post_terms( get_the_id(), 'product_cat', array('fields' => 'names') );
        $tags = (array) wp_get_post_terms( get_the_id(), 'product_tag', array('fields' => 'names') );
    }
    if ( ! empty( $cats ) || ! empty( $tags ) ){
        echo '<meta name="keywords" content="' . implode( ', ', array_merge( $cats, $tags ) ) . '" />' . "\n";
    }
}

For WooCommerce only use:

add_action( 'wp_head', 'wcs_add_meta_keywords', 2);
function wcs_add_meta_keywords() {
    if ( is_product() ) {
        $product_cats = (array) wp_get_post_terms( get_the_id(), 'product_cat', array('fields' => 'names') );
        $product_tags = (array) wp_get_post_terms( get_the_id(), 'product_tag', array('fields' => 'names') );
    }
    if ( ! empty( $product_cats ) || ! empty( $product_tags ) ){
        echo '<meta name="keywords" content="' . implode( ', ', array_merge( $product_cats, $product_tags ) ) . '" />' . "\n";
    }
}

Code goes in functions.php file of your active child theme (active theme). Tested and works.