Detect type of post status transition

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I have a function on my site that it supposed to run when a new post is published (email push notification), with the exception of the same article updated (i.e publish_to_publish transition, I don’t want to send unnecessary push notifications)

I know that I can use the {old_status} to {new_status} action hooks, but this means that I have to specify all the transitions to publish (new_to_publish, draft_to_publish, etc.).

My question is:

  1. Can I use instead the publish_post hook and detect if it was publish_to_publish so I can explicitly negate it? something like:

    function send_email() {
 if ($transition == 'publish_to_publish') return;
  //(else) send email
}
  add_action('publish_post', 'send_email', 10, 1);

  2. If not, how do I tie multiple hooks to the same action? Do I just list them like so:

    add_action('new_to_publish', 'send_mail', 10, 1);
add_action('future_to_publish', 'send_mail', 10, 1);
add_action('draft_to_publish', 'send_mail', 10, 1);

Or is there a more elegant way – like passing an array?

2 Answers
2

If not, how do I tie multiple hooks to the same action? Do I just list
them like so:

add_action('new_to_publish', 'save_new_post', 10, 1);
add_action('future_to_publish', 'save_new_post', 10, 1);
add_action('draft_to_publish', 'save_new_post', 10, 1);

This is exactly the way to go. Just hook the same callback into each of the status-transition hooks on which you want the callback to fire.

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