Sorting multi-dimensional associative array in PHP -

i have php array looks this:

array (size=1)   'marriot' =>      array (size=7)       0 => string 'doc5.txt' (length=8)       1 => string 'test.txt' (length=8)       2 => string 'test1.txt' (length=9)       3 => string 'test2.txt' (length=9)       4 => string 'test3.txt' (length=9)       5 =>          array (size=1)           'special docs' =>              array (size=2)               0 => string 'doc4.txt' (length=8)               1 => string 'doc3.txt' (length=8)       6 =>          array (size=1)           'adocs' =>              array (size=0)               empty 

as can see, holds non-associative files, , 2 folders, "special docs" , "adocs". problem two-fold:

first, want move 2 folders top of array prominent in view. second, want sort folders alphabetically (i.e. put "adocs" above "special docs". have tried array_multisort without success , sort of stuck here. know how might achieve this?

thanks help.

example input

$dir = array(     0 => 'doc5.txt',     1 => 'test.txt',     2 => 'test1.txt',     3 => 'test2.txt',     4 => 'test3.txt',     5 => array(         'special docs' => array (               0 => 'doc4.txt',               1 => 'doc3.txt'           )     ),     6 => array(          'adocs' => array()     ) ); 

1 level sorting

function cmp ($a,$b) {     if (is_array($a)){         if (is_array ($b)) {             return strnatcasecmp (key($a), key($b));         } else {             return -1;         }     } else {         if (is_array ($b)) {             return 1;         } else {             return strnatcasecmp ($a, $b);         }     } } 

example output

array (     [0] => array         (             [adocs] => array                 (                 )          )      [1] => array         (             [special docs] => array                 (                     [0] => doc4.txt                     [1] => doc3.txt                 )          )      [2] => doc5.txt     [3] => test.txt     [4] => test1.txt     [5] => test2.txt     [6] => test3.txt ) 

multi level sorting (unlimited)

function cmp (&$a,&$b) {     if (is_array($a)){         usort($a[key($a)], 'cmp');         if (is_array ($b)) {             return strnatcasecmp (key($a), key($b));         } else {             return -1;         }     } else {         if (is_array ($b)) {             return 1;         } else {             return strnatcasecmp ($a, $b);         }     } }  usort ($dir, 'cmp'); 

example output

array (     [0] => array         (             [adocs] => array                 (                 )          )      [1] => array         (             [special docs] => array                 (                     [0] => doc3.txt                     [1] => doc4.txt                 )          )      [2] => doc5.txt     [3] => test.txt     [4] => test1.txt     [5] => test2.txt     [6] => test3.txt )