How to update post_modified FAST after each comment?

One of my ways of keeping my posts up to date is to update the post_modified value after some of certain actions like commenting, liking…

You shouldn’t use wp_update_post() because it calls wp_insert_post(), which determines that the post exists and sets the post_modified and post_modified variables to the current date.

This process will take way longer than using direct DB query.

function vl_post_modified_update ($post_id) {
global $wpdb;
// Get the current time
$time = current_time('mysql');
$post_modified_gmt = get_gmt_from_date($time);

$post_id = 123; //the post ID;

$res = $wpdb->query("UPDATE $wpdb->posts SET post_modified = '{$time}', post_modified_gmt = '{$post_modified_gmt}'  WHERE ID = {$post_id}" );
return $res;

Next step is to hook this function after user comment is submited


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