Using a Shortcode to List Posts from Multiple Categories

Maybe you can make it so that you can use the shortcode like [list-products categories=”1,2,3″], and then explode them as an array to insert them as your terms?

<?php
function list_products_func($atts) {

   $a = shortcode_atts(array(
      'categories' => '',
   ), $atts);

   // Check for multiple categories by comma
   if ( strpos( $a['categories'], ',' ) !== false ) {
      $terms = explode( $a['categories'] );
   } else {
      $terms = $a['categories'];
   }

   $args = array(
      'posts_per_page'  => -1,
      'tax_query'       => array(
         'relation'     => 'AND',
         array(
            'taxonomy'  => 'product_cat',
            'field'     => 'slug',
            'terms'     => $terms // Your exploded terms array 
         )
      ),
      'post_type' => 'product',
      'orderby'   => 'title,'
   );

   $products = new WP_Query($args);
   echo "<table>";
   while ($products->have_posts()) {

      $products->the_post();
      $product = new WC_Product(get_the_ID()); ?>
      <tr class="product-list-item">
         <td><a href="https://wordpress.stackexchange.com/questions/252258/<?php the_permalink(); ?>"><?php the_title(); ?></a></td>
         <td><?php echo get_the_excerpt(); ?></td>
         <td><?php echo $product->get_price_html(); ?></td>
         <td>
            <?php echo woocommerce_quantity_input(
            array(
               'min_value' => 1,
               'max_value' => $product->backorders_allowed() ? '' : $product->get_stock_quantity(),
            )); ?>
         </td>
         <td><?php echo woocommerce_template_loop_add_to_cart(); ?></td>
      </tr>
      <?php

   }
   echo "</table>";
}
add_shortcode('list_products', 'list_products_func');
?>

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