Online PHP editor | refs for 605SI

<?php $selected_emails = array( 16781 => "xxx@gmail.com", 16782 => "yyy@gmail.com", 16785 => "xxx@gmail.com,yyy@gmail.com", 16789 => "yyy@gmail.com", 16751 => "xxx@gmail.com,yyy@gmail.com,zzz@gmail.com", 16729 => "zzz@gmail.com,bbb@gmail.com" ); $final_array = array(); foreach ($selected_emails as $newsletter => $emails) { foreach (explode(',', $emails) as $email) { $final_array[$email][] = $newsletter; } } var_dump($final_array);