echo '<input type="checkbox" value="' . $row['id'] . '" name="todelete[]">';The square brackets result in the creation of an array within $_POST that stores the contents of the value attribute of every checked checkbox in the form.
The square brackets at the end of the checkbox name automatically put the
checkbox values in an array we've named “todelete[]”.
(from: Head First PHP and MySQL P215/255)
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