PHP array values Uniqify

<?php
$array = array(
        0=> array('title'=> 'Dhaka','area'=>'Katabon'),
        1=> array('title'=>'Dhaka', 'area'=>'Polashi'),
        2=> array('title'=>'Narayanganj', 'area'=> 'Fotulla'),
        3=> array('title'=>'Narayanganj', 'area'=> 'lalpur')
     );
$keys    = array_map(create_function('$i', 'return $i["title"];'), $array)
$deduped = array_combine($keys, $array);
$result  = array_values($deduped);
?>