Online PHP editor | refs for tIak4

<?php $array = [ 'product2' => [ 'dates' => [ '2013-07-25' => 2, '2013-07-23' => 1, '2013-07-21' => 3 ] ], 'product3' => [ 'dates' => [ '2013-07-24' => 5, '2013-07-22' => 4, '2013-07-20' => 3 ] ], 'product1' => [ 'dates' => [ '2013-07-29' => 1, '2013-07-28' => 2, '2013-07-27' => 2 ] ] ]; ksort($array); foreach ($array as ['dates' => &$dates]) { ksort($dates); } var_export($array);