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So I added a new submission button to the edit page:

Using the post_submitbox_misc_actions hook with the submit_button($text, $type, $name); function.

I wanted to modify the data that's saved based on what button the user clicks. So if the user clicks on the regular update/submit button then the post would save normally. However if the user clicks on the new button, then I would modify some information about that post.

I was planning to use the wp_insert_post_data hook to modify the data, but the problem is that I don't know what button the user clicked (using php).

So my question... is it possible to identify which button the user clicked using a hook (or some other method)?

Or, is this not the correct approach? And I should use some other method to interfere the save action?

Update:

I also tried logging $_GET and $_POST to see if there was any relevant information there, but couldn't find anything.

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The function submit_button() does generate:

<input type="submit" name="submit" id="submit" class="button button-primary" value="Save Changes"  />

As seen on the codex documentation page. Which gives you the possibility to check for a $_POST or, depending on the form, $_GET or generic $_REQUEST variable - to be exact for $_POST[ 'submit' ] or $_GET[ 'submit' ] or $_REQUEST[ 'submit' ]. The key for the variable is determined by the input tags name attribute value, which you can change for submit_button() by making use of the $name parameter.

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    Gotcha. I was expecting to see something like $_POST['submit'] = 'my_submit_button_value", where the array key is always 'submit', but the value changes according to the name attribute. But instead, what I see is the key as the submit button 'name' and the value as the submit button 'value'. So I just need to check of the key exists, and if it matches the value. – gdaniel Jan 13 '16 at 21:20
  • Totally forgot to explain the value part, but you figured it out yourself anyway. I would figure that should be enough to determine the button pressed, right? @gdaniel – Nicolai Jan 13 '16 at 21:21
  • @gdaniel My pleasure! – Nicolai Jan 13 '16 at 21:29

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