<?php $arr = ["A" => "a", "B" => ["C"=> "c", "D"=> "d"]]; function array_flatten($array) { $return = array(); foreach ($array as $key => $value) { if (is_array($value)) $return = array_merge($return, array_flatten($value)); else {$return[$key] = $value;} } return $return; } print_r(array_flatten($arr));
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