<?php $arr = [ [ 20190529 => [ 30 => [ 17 => [ 3846 => 0, ], ], ], ], [ 20190516 => [ 31 => [ 17 => [ 512 => 0, ], ], ], ], ]; $keys = []; foreach($arr as $k => $item){ $keys[] = key($item); } array_multisort($keys, SORT_NATURAL, $arr); print_r($arr);die;
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