man4toman

<?php namespace GM\WWWPostThumbnail;
/**
 * Plugin Name: WWW Post Thumbnail
 * Description: Allow to use an external image url as featured image.
 * Plugin URI: https://gist.github.com/Giuseppe-Mazzapica/928bc22e5f49a654cf7c
 * Author: Giuseppe Mazzapica
 * Author URI: https://github.com/Giuseppe-Mazzapica
 * License: MIT
 * Version: 0.1.0
 *

man4toman

// First Register the Tab by hooking into the 'woocommerce_product_data_tabs' filter
add_filter( 'woocommerce_product_data_tabs', 'add_my_custom_product_data_tab' );
function add_my_custom_product_data_tab( $product_data_tabs ) {
    $product_data_tabs['my-custom-tab'] = array(
        'label' => __( 'My Custom Tab', 'woocommerce' ),
        'target' => 'my_custom_product_data',
        'class'     => array( 'show_if_simple' ),
    );
    return $product_data_tabs;
}