How to sum custom field values with specific post type and category?

  • Hello, experts.

    As the title, I’d like to sum custom field values each posts.

    Post type is ‘testimonials’.
    When I input Category ID and Custom field meta key, I want to return the sum of their values.

    I think the function like this…

    function( &testimonials_category_id, &meta_key){
    …
    …
    return $total_value;
    };

    Always Appreciating your Helps. ??

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