array unique not working in php

array unique not working in php? what am i doing wrong?

<?php
$selectquery=mysql_query("select menumanagement.*,usermanagment_permission.* from menumanagement,usermanagment_permission where usermanagment_permission.permission_menu_id=menumanagement.mn_id");
while($selectquery1=mysql_fetch_array($selectquery)) {
  $menunam=$selectquery1["mn_menuname"];
  $ddddd=array($menunam);
  print_r(array_unique($ddddd));
}
?>

output:

Array ( [0] => Applicant ) 
Array ( [0] => Skill Set )
Array ( [0] => Applicant )
Array ( [0] => Add Employee )
Array ( [0] => Applicant )
Array ( [0] => Add Employee )
Array ( [0] => Skill Set )