Sorting a multidimensional array

multidimensional_arr_sort.php

/*
array (size=4)
  0 => 
    array (size=2)
      'screen_id' => string 'A0E6457F-EF4F-4BEF-811A-0ACE00AE6225' (length=36)
      'name' => string 'Level 1 - Stalls' (length=16)
  1 => 
    array (size=2)
      'screen_id' => string 'A34D24F8-B1C5-4E26-A1FE-91A3C13A4F10' (length=36)
      'name' => string 'Level 2 - Dress Circle' (length=22)
  2 => 
    array (size=2)
      'screen_id' => string '9C433821-1F3D-4685-94D0-F0020597A7C5' (length=36)
      'name' => string 'Level 3 - Royal Circle' (length=22)
  3 => 
    array (size=2)
      'screen_id' => string '2AE67063-A1B3-4521-BAB9-1B38BC9DBCA7' (length=36)
      'name' => string 'Level 4 - Balcony' (length=17)
*/

		function cmp($a, $b) {
			return strcmp($a['name'], $b['name']);
		}
		usort($arr, 'cmp');