Filtering Title in Search Results

Hi,

I am trying to use the following filter to add extra info the the title in my search results, but it does not seem to be working:

add_filter( ‘aws_title_search_result’, ‘my_aws_title_search_result’, 10, 3 );

I am using custom fields and I am trying to concatenate them to the title in search results. Here is my code for getting the custom fields data:

global $post;
$text1 = get_post_meta( $post->ID, ‘_tyre_size_field’, true );
$text2 = get_post_meta( $post->ID, ‘_load_speed_field’, true );
$text3 = get_post_meta( $post->ID, ‘_tyre_brand_field’, true );
$text4 = get_post_meta( $post->ID, ‘_brand_model_field’, true );
$text5 = get_post_meta( $post->ID, ‘_run_flat_field’, true );

I would like to concatenate my title like so:

function my_aws_title_search_result( $title, $post_id, $product ) {
$title = $title . $text1 . text2 . text3 . text4 . text5;
return $title;
}

Please advise how I should go about doing this?

Thanks