I am writing an extension for the hook


I see that it has 3 params(meta, data, autosave).

I look at data and I see there is channel data in there and a revision post data index.

I assumed that the revision post data contains the old, not updated data.

But when I compared then to the top level data, they are the same. Both also show the updated data.

Is there any way I can access the old data? Do I need to use a different hook?

How do I know if a field value has been changed by edits?

  • 1. isn't revision data only available when revisions are enabled on a channel? 2. To make sure if data is changed by an edit: a) store a copy of the field data at, say, the publish_form_entry_data() hook and check it on entry_submission_ready, or b) check against the database after submit.
    – GDmac
    Feb 13, 2013 at 9:59
  • @GDmac good suggestions. Will try some of your solutions. Feb 14, 2013 at 1:40

1 Answer 1


That hook gives you all the data you need to query the database. $meta will hold your entry_id, channel_id, title, etc (anything that goes in exp_channel_titles), and $data holds your custom field data.

So just as an example:

    $current = $this->EE->db->query("
        SELECT * FROM exp_channel_data WHERE entry_id = {$meta['entry_id']} LIMIT 1
    if($current->num_rows() == 1)
        if($data['field_id_1'] === $current->row('field_id_1'))
            // Data has not changed in field_id_1
  • Ok, so your solution basically means that I should compare $data with the database values using entry id as the key. I will try if it works. Feb 14, 2013 at 1:41

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