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public function product_term($post_id=null, $arg='term_id'){ 
    if(!$post_id) {
      global $post;
      $post_id = $post->ID;
    }
    $terms = get_the_terms( $post_id, 'product_cat' );
    if(!$terms) return;
    foreach ($terms as $term) {
        if($arg == 'term_id') return $term->term_id;
        if($arg == 'name') return $term->name;
        break;
    }
  }