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<?php $arr=array( "0"=> array( 0=> array ( "ID"=> 118, "post_date"=> "2014-04-28 07:27:37", "post_title"=> "Title 1" ), 1=> array ( "ID"=> 119, "post_date"=> "2014-04-29 07:27:37", "post_title"=> "title 2" ) ), "1"=> array( 0=> array ( "ID"=> 135, "post_date"=> "2014-04-28 06:37:37", "post_title"=> "Title 3" ), 1=> array ( "ID"=> 148, "post_date"=> "2014-04-25 07:27:37", "post_title"=> "Title 4" ) ), "2"=> array( 0=> array ( "ID"=> 135, "post_date"=> "2014-04-24 06:37:37", "post_title"=> "Title 5" ), 1=> array ( "ID"=> 148, "post_date"=> "2014-04-25 09:21:37", "post_title"=> "Title 6" ) ) ); usort($arr, function($a, $b) { return $a['ID'] - $b['ID']; }); print_r($arr);