Php Woocommerce自定义变体html表仅显示带值的列

try 执行以下操作，仅当表列有值时才显示该表列:

add_action( 'woocommerce_after_single_product_summary', 'custom_table_after_single_product' );
function custom_table_after_single_product(){
    global $product;

    if( ! $product->is_type('variable')) return;
    
    // Get available variations
    $variations = $product->get_available_variations('object');       

    if( count($variations) > 0 ){
        // Set the table columns heading in an array
        $table_head = array(
            'image'         => __( 'Image', 'woocommerce' ),
            'sku'           => __( 'SKU', 'woocommerce' ),
            'colour'        => __( 'Colour', 'woocommerce' ),
            'technology'    => __( 'Technology', 'woocommerce' ),
            'posneg'        => __( 'Positive/Negative', 'woocommerce' ),
        );

        $table_columns = array_keys($table_head);
        $table_data = $variation_ids = array(); // Initializing

        // Set the table columns values in an array sorted by column
        foreach ( $variations as $variation ) {
            $variation_id    = $variation->get_id();
            $variation_ids[] = $variation_id;

            if ( $image = $variation->get_image('snippets') ) {
                $table_data['image'][$variation_id] = $image;
            }
            if ( $sku = $variation->get_sku() ) {
                $table_data['sku'][$variation_id] = $sku;
            }
            if ( $colour = $variation->get_attribute('pa_colour_range') ) {
                $table_data['colour'][$variation_id] = $colour;
            }
            if ( $technology = $variation->get_attribute('pa_technology') ) {
                $table_data['technology'][$variation_id] = $technology;
            }
            if ( $posneg = $variation->get_attribute('pa_posneg') ) {
                $table_data['posneg'][$variation_id] = $posneg;
            }
        }

        // Output start
        $output = '<table>
            <thead>
                <tr>';

                // Loop through table head columns
                foreach ( $table_head as $column => $column_label ) {
                    if( isset($table_data[$column]) ) {
                        $output .= '<th>'. $column_label .'</th>';
                    }
                }
                $output .= '</tr>
            </thead>
            <tbody>';

        // Loop through variations Ids
        foreach( $variation_ids as $variation_id ){
            $output .= '<tr>';

            // Loop through table columns
            foreach ( $table_columns as $column ) {
                if( isset($table_data[$column]) ) {
                    $output .= '<td>'. $table_data[$column][$variation_id] .'</td>';
                }
            }
            $output .= '</tr>';
        }
        $output .= '
            </tbody>
        </table>';

        echo $output;
    }
}

代码放在活动子主题(或活动主题)的函数.php文件中.经过测试，效果良好.