Return all category ids of WooCommerce

functions.php

<?php

function wcget_category_ids(){
  
  $orderby = 'name';
  $order = 'asc';
  $hide_empty = false ;
  $cat_args = array(
      'orderby'    => $orderby,
      'order'      => $order,
      'hide_empty' => $hide_empty,
  );

  $product_categories = get_terms( 'product_cat', $cat_args );

  $category_ids = array();

  if( !empty($product_categories) ){
    foreach ($product_categories as $key => $value) {
      $category_ids[] = $value->term_id;
    }
  }
  
  return $category_ids;
}

?>