Online PHP editor | output for 6LmII

<?php $items_thread=Array ( 0 => Array ( 'RecipientID' => 3, 'RecipientScreenname' => 'Tom L', 'RecipientFirstname' => 'Thomas', 'RecipientEmail'=> 'info@xx.com', ), 1 => Array ( 'RecipientID' => 3, 'RecipientScreenname' => 'Tom L', 'RecipientFirstname' => 'Thomas', 'RecipientEmail'=> 'info@xx.com', ), 2 => Array ( 'RecipientID'=> 1, 'RecipientScreenname' => 'Lau T', 'RecipientFirstname' => 'TK', 'RecipientEmail' => l'au@xx.co.uk', ) ) But I want to get rid of the duplicate items in the array, so I use array_unique print_r(array_unique($items_thread));