<?php $array = [ 'Foo', 'bAr' => 'BaR', /*'suB' => [ 'a' => 1, 2 => 'b', 'C' => null, ], 'obj' => (object) [ 'd' => 1.333, 'SubArR' => [ 'This' => 'Is', 'a' => 'challenge', ] ]*/ ]; var_export( array_map(strtolower(...), $array) );
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