Queue note notifications with cron

Note: requires cron be active for notifications to work

Author: adamsilverstein

src/wp-includes/comment.php

@@ -2466,10 +2466,24 @@ function wp_new_comment_notify_postauthor( $comment_id ) {
  */
 function wp_new_comment_via_rest_notify_postauthor( $comment ) {
 	if ( 'note' === $comment->comment_type ) {
-		wp_new_comment_notify_postauthor( $comment->comment_ID );
+		// Queue up the email notification as a cron callback. The second parameter ensures each callback is executed.
+		wp_schedule_single_event( time(), 'wp_new_comment_via_rest_notify_postauthor', array( $comment->comment_ID, time() ) );
 	}
 }
 
+/**
+ * Cron callback to send an author email notifcation, keeping the action asynchronous.
+ */
+function wp_new_comment_via_rest_notify_postauthor_cron( $comment_id ) {
+	$comment = get_comment( $comment_id );
+	if ( $comment ) {
+		wp_new_comment_notify_postauthor( $comment_id );
+	}
+}
+
+// Add a custom hook for the note notification cron job.
+add_action( 'wp_new_comment_via_rest_notify_postauthor', 'wp_new_comment_via_rest_notify_postauthor_cron' );
+
 /**
  * Sets the status of a comment.
  *