php - Reordering 2D array by value - 


$array = json_decode('[{"3609":1368486012},{"4286":1368546869},{"286":136848555}]',true);

what efficient way reorder value decending (timestamp)?

reset returns value of first array element.

code:

$array = json_decode('[{"3609":1368486012},{"4286":1368546869},{"286":136848555}]',true);  usort($array, function($a, $b) {     return reset($b) - reset($a); });  var_dump($array);

result:

array(3) {   [0]=>   array(1) {     [4286]=>     int(1368546869)   }   [1]=>   array(1) {     [3609]=>     int(1368486012)   }   [2]=>   array(1) {     [286]=>     int(136848555)   } }

note: if use php 5.2 ,

$array = json_decode('[{"3609":1368486012},{"4286":1368546869},{"286":136848555}]',true);  function mysort($a, $b) {     return reset($b) - reset($a); } usort($array, 'mysort');  var_dump($array);

oh, sorry
if compare float,

function mysort($a, $b) {     if ($a == $b)          return 0;     return ($a < $b) : 1 : -1; }

or

function mysort($a, $b) {     return sprintf('%e', reset($b) - reset($a)); }

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