yeah, I've done this in the past to delete a list of members. Here's what i did.
The list of members was stored in the database. I dynamically created a list of the members that looked like this
[ ] Member Name Email
[ ] Member Name Email
[ ] Member Name Email
The checkboxes all had the same name; they were an array. So you have to name them something like
<input type="checkbox" name="to_update[]" value="<?= $row["id"] ?>">
This would give you the array $to_update to work with, and the value of each array key would be the members id in the database. Then, you can loop through the results on the processing page and do what you want with it.