Php two-dimensional array sorting

Php 2D array sorting problem help sort existing array PHPcode $ a = array (0 = & gt; array (3 = & gt; 9), 1 = & gt; array (2 = & gt; 9), 2 = & gt; array (6 = & gt; 5), php two-dimensional array sorting problem to help sort
Existing array

PHP code

  $a=array(         0=>array(3=>9),    1=>array(2=>9),    2=>array(6=>5),    3=>array(1=>15),    4=>array(2=>4),);

The sorting is as follows:

PHP code

  $b=array(    0=>array(1=>15),    1=>array(3=>9),    2=>array(2=>9),    3=>array(6=>5),    4=>array(2=>4),    );

Wish you all the best!

------ Solution --------------------

PHP code

$ A = array (0 => array (3 => 9), 1 => array (2 => 9), 2 => array (6 => 5 ), 3 => array (1 => 15), 4 => array (2 => 4),); foreach ($ a as $ v) {$ r [] = current ($ v); $ k [] = key ($ v);} array_multisort ($ r, SORT_DESC, $ k, SORT_DESC, $ ); print_r ($ );
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   Discussion
   
PHP code
   

   
$ A = array (
   
0 => array (3 => 9 ),
   
1 => array (2 => 9 ),
   
2 => array (6 => 5 ),
   
3 => array (1 => 15 ),
   
4 => array (2 => 4 ),
   
);
   

   
Foreach ($ a as $ v ){
   
$ R [] = current ($ v );
   
$ K [] = key ($ v );
   
}
   
......
   

  
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Taught
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My blog has exactly one. The first floor is Pediatrics.
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No dressing change

  
  

   
   
PHP code
   
   
……usort($a, create_function('$m, $n', 'return current($m)==current($n) ? (key($m)==key($n) ? 0 : key($m)
    
      Array        (            [1] => 15        )    [1] => Array        (            [3] => 9        )    [2] => Array        (            [2] => 9        )    [3] => Array        (            [6] => 5        )    [4] => Array        (            [2] => 4        ))/**/