function minha_funcao() {
  //código da minha função
  echo '<div>Minha DIV</div>';
}
add_action( 'nome-do-hook' , 'minha_funcao' );

/**
 * @snippet       Lista de ações padrões em WooCommerce Single Product
 * @doar          https://www.paypal.me/RafaCarvalhido
 */

// Estas são as actions que você pode enganchar sua função!
// Você pode, inclusive, unhook ou desenganchar umas dessas funções reais abaixo.
 
 
// antes do conteúdo
add_action( 'woocommerce_before_main_content', 'woocommerce_breadcrumb', 20, 0 );
add_action( 'woocommerce_sidebar', 'woocommerce_get_sidebar', 10 );
add_action( 'woocommerce_before_single_product', 'woocommerce_output_all_notices', 10 );
  
// coluna da esquerda
add_action( 'woocommerce_before_single_product_summary', 'woocommerce_show_product_sale_flash', 10 );
add_action( 'woocommerce_before_single_product_summary', 'woocommerce_show_product_images', 20 );
add_action( 'woocommerce_product_thumbnails', 'woocommerce_show_product_thumbnails', 20 );
 
// coluna da direita
add_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_title', 5 );
add_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_rating', 10 );
add_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_price', 10 );
add_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_excerpt', 20 );
 
// coluna da direita - add to cart
do_action( 'woocommerce_before_add_to_cart_form' );
do_action( 'woocommerce_before_add_to_cart_button' );
add_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_add_to_cart', 30 );
 
add_action( 'woocommerce_simple_add_to_cart', 'woocommerce_simple_add_to_cart', 30 );
add_action( 'woocommerce_grouped_add_to_cart', 'woocommerce_grouped_add_to_cart', 30 );
add_action( 'woocommerce_variable_add_to_cart', 'woocommerce_variable_add_to_cart', 30 );
add_action( 'woocommerce_external_add_to_cart', 'woocommerce_external_add_to_cart', 30 );
add_action( 'woocommerce_single_variation', 'woocommerce_single_variation', 10 );
add_action( 'woocommerce_single_variation', 'woocommerce_single_variation_add_to_cart_button', 20 );
do_action( 'woocommerce_before_quantity_input_field' );
do_action( 'woocommerce_after_quantity_input_field' );
do_action( 'woocommerce_after_add_to_cart_button' );
do_action( 'woocommerce_after_add_to_cart_form' );
 
// coluna da direita - meta
add_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_meta', 40 );
do_action( 'woocommerce_product_meta_start' );
do_action( 'woocommerce_product_meta_end' );
 
// coluna da direita - compartilhamento
add_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_sharing', 50 );
do_action( 'woocommerce_share' );
 
// tabs, upsells e produtos relacionados
add_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_product_data_tabs', 10 );
add_action( 'woocommerce_product_additional_information', 'wc_display_product_attributes', 10 );
do_action( 'woocommerce_product_after_tabs' );
add_action( 'woocommerce_after_single_product_summary', 'woocommerce_upsell_display', 15 );
add_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_related_products', 20 );
 
// aAvaliações
add_action( 'woocommerce_review_before', 'woocommerce_review_display_gravatar', 10 );
add_action( 'woocommerce_review_before_comment_meta', 'woocommerce_review_display_rating', 10 );
add_action( 'woocommerce_review_meta', 'woocommerce_review_display_meta', 10 );
do_action( 'woocommerce_review_before_comment_text', $comment );
add_action( 'woocommerce_review_comment_text', 'woocommerce_review_display_comment_text', 10 );
do_action( 'woocommerce_review_after_comment_text', $comment );
 
// após conteúdo
do_action( 'woocommerce_after_single_product' );
do_action( 'woocommerce_after_main_content' );