Meta box with a wysiwyg field displayed on Woocommerce single product custom tabs

Here is the way to add your 2 custom fields (editor wysiwyg) in Admin edit product pages and display the values in front-end single product pages custom tabs:

## ---- 1. Backend ---- ##// Adding a custom Meta container to admin products pagesadd_action( 'add_meta_boxes', 'create_custom_meta_box' );if ( ! function_exists( 'create_custom_meta_box' ) ){    function create_custom_meta_box()    {        add_meta_box(            'custom_product_meta_box',            __( 'Additional Product Information <em>(optional)</em>', 'cmb' ),            'add_custom_content_meta_box',            'product',            'normal',            'default'        );    }}//  Custom metabox content in admin product pagesif ( ! function_exists( 'add_custom_content_meta_box' ) ){    function add_custom_content_meta_box( $post ){        $prefix = '_bhww_'; // global $prefix;        $ingredients = get_post_meta($post->ID, $prefix.'ingredients_wysiwyg', true) ? get_post_meta($post->ID, $prefix.'ingredients_wysiwyg', true) : '';        $benefits = get_post_meta($post->ID, $prefix.'benefits_wysiwyg', true) ? get_post_meta($post->ID, $prefix.'benefits_wysiwyg', true) : '';        $args['textarea_rows'] = 6;        echo '<p>'.__( 'Ingredients', 'cmb' ).'</p>';        wp_editor( $ingredients, 'ingredients_wysiwyg', $args );        echo '<p>'.__( 'Benefits', 'cmb' ).'</p>';        wp_editor( $benefits, 'benefits_wysiwyg', $args );        echo '<input type="hidden" name="custom_product_field_nonce" value="' . wp_create_nonce() . '">';    }}//Save the data of the Meta fieldadd_action( 'save_post', 'save_custom_content_meta_box', 10, 1 );if ( ! function_exists( 'save_custom_content_meta_box' ) ){    function save_custom_content_meta_box( $post_id ) {        $prefix = '_bhww_'; // global $prefix;        // We need to verify this with the proper authorization (security stuff).        // Check if our nonce is set.        if ( ! isset( $_POST[ 'custom_product_field_nonce' ] ) ) {            return $post_id;        }        $nonce = $_REQUEST[ 'custom_product_field_nonce' ];        //Verify that the nonce is valid.        if ( ! wp_verify_nonce( $nonce ) ) {            return $post_id;        }        // If this is an autosave, our form has not been submitted, so we don't want to do anything.        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {            return $post_id;        }        // Check the user's permissions.        if ( 'product' == $_POST[ 'post_type' ] ){            if ( ! current_user_can( 'edit_product', $post_id ) )                return $post_id;        } else {            if ( ! current_user_can( 'edit_post', $post_id ) )                return $post_id;        }        // Sanitize user input and update the meta field in the database.        update_post_meta( $post_id, $prefix.'ingredients_wysiwyg', wp_kses_post($_POST[ 'ingredients_wysiwyg' ]) );        update_post_meta( $post_id, $prefix.'benefits_wysiwyg', wp_kses_post($_POST[ 'benefits_wysiwyg' ]) );    }}## ---- 2. Front-end ---- ##// Create custom tabs in product single pagesadd_filter( 'woocommerce_product_tabs', 'custom_product_tabs' );function custom_product_tabs( $tabs ) {    global $post;    $product_ingredients = get_post_meta( $post->ID, '_bhww_ingredients_wysiwyg', true );    $product_benefits    = get_post_meta( $post->ID, '_bhww_benefits_wysiwyg', true );    if ( ! empty( $product_ingredients ) )        $tabs['ingredients_tab'] = array(            'title'    => __( 'Ingredients', 'woocommerce' ),            'priority' => 45,            'callback' => 'ingredients_product_tab_content'        );    if ( ! empty( $product_benefits ) )        $tabs['benefits_tab'] = array(            'title'    => __( 'Benefits', 'woocommerce' ),            'priority' => 50,            'callback' => 'benefits_product_tab_content'        );    return $tabs;}// Add content to custom tab in product single pages (1)function ingredients_product_tab_content() {    global $post;    $product_ingredients = get_post_meta( $post->ID, '_bhww_ingredients_wysiwyg', true );    if ( ! empty( $product_ingredients ) ) {        echo '<h2>' . __( 'Product Ingredients', 'woocommerce' ) . '</h2>';        // Updated to apply the_content filter to WYSIWYG content        echo apply_filters( 'the_content', $product_ingredients );    }}// Add content to custom tab in product single pages (2)function benefits_product_tab_content() {    global $post;    $product_benefits = get_post_meta( $post->ID, '_bhww_benefits_wysiwyg', true );    if ( ! empty( $product_benefits ) ) {        echo '<h2>' . __( 'Product Benefits', 'woocommerce' ) . '</h2>';        // Updated to apply the_content filter to WYSIWYG content        echo apply_filters( 'the_content', $product_benefits );    }}

Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

Tested and works. You will get:

1) In backend:

2) In Front-end: