Which function exactly being called by call_user_func Plz read message below

  • I have been tracking out Hows wordpress insert new posts alongwith their categories into database and updating tables wp_posts,wp_term_taxonomy, wp_term_relationships etc…
    While tracking down file taxonomy.php at wp-includes/ folder I stumbled at following function
    call_user_func($taxonomy->update_count_callback, $terms, $taxonomy);
    inside function wp_update_term_count_now( $terms, $taxonomy ) function.

    I am not sure exactly where call_user_func call is going.
    As I echoed $taxonomy->update_count_callback it displayed text
    _update_post_term_count .

    As I know call_user_func calls function in first argument but whatever is the function in first argument above is complex.

    Anyone please help me how to trace this function ?

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