Adding code to a php function with a separate php function

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I have a php function called wc_print_notices that is in the core files of woocommerce, and I don’t wish to edit the core files if I can avoid it.

So I would like to write something in my functions.php file that will add more functionality to this function.

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I’ve tried using filters, however, those only work with woocommerce functions that act as hooks, and this is a function that is called through a hook, so do_action() and add_filter do not work with wc_print_notices

I want to add related products to this function, and have tried something like this 

function popup_products( $popup ){
    $popup = woocommerce_output_related_products();
  return $popup;
}

The function itself works perfectly, however, I want to add this to the function wc_print_notices

the filters I tried were: 

add_filter( 'wc_print_notices', 'popup_products', 1, 1);
add_filter( 'wc_print_notices', 'popup_products', 99, 99);
add_filter( 'wc_print_notices', 'popup_products', 1);
add_filter( 'wc_print_notices', 'popup_products', 99);
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1 comment

  1. Since wc_print_notices is being called by add_action( 'woocommerce_before_shop_loop', 'wc_print_notices', 10 ); i think you need to remove that action with remove_action then add_action( 'woocommerce_before_shop_loop', 'my_custom_wc_print_notices', 10 );

    https://docs.woothemes.com/wc-apidocs/source-function-wc_print_notices.html#106-129

    Maybe adding additional notices.

    https://docs.woothemes.com/wc-apidocs/source-function-wc_print_notices.html#75-91

    I think in your case if all you want to do is add additional information all you have todo is add it in one of the Woocommerce Loop’s.

    add_action('woocommerce_before_shop_loop','popup_products');

    With OP Clarification

    function custom_wc_print_notices() {
if ( ! did_action( 'woocommerce_init' ) ) {
         _doing_it_wrong( __FUNCTION__, __( 'This function should not be called before woocommerce_init.', 'woocommerce' ), '2.3' );
         return;
     }

     $all_notices  = WC()->session->get( 'wc_notices', array() );
     $notice_types = apply_filters( 'woocommerce_notice_types', array( 'error', 'success', 'notice' ) );

     foreach ( $notice_types as $notice_type ) {
         if ( wc_notice_count( $notice_type ) > 0 ) {
             // Call your function here and make sure it only output once
             woocommerce_output_related_products();
             /********************************************/
             wc_get_template( "notices/{$notice_type}.php", array(
                 'messages' => $all_notices[$notice_type]
             ) );
         }
     }

     wc_clear_notices();
}

    I think the best bet is like i suggest before to remove the default add_action place it back with your modified version of wc_print_notices.

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