<?php $arr = [ "EU" => [ 0 => "NL", 1 => "BE", 3 => "FR", 4 => "DE", 5 => "ES", 6 => "IT", 7 => "GB", 8 => "TR", 9 => "DK", ], "AS" => ["AB", "AA"] ]; array_walk($arr, fn(&$row) => sort($row)); var_export($arr);
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