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<?php function arrayFlattenSep($sep, $array) { $result = array(); $stack = array(); array_push($stack, array("", $array)); while (count($stack) > 0) { list($prefix, $array) = array_pop($stack); foreach ($array as $key => $value) { $new_key = $prefix . strval($key); if (is_array($value)) array_push($stack, array($new_key . $sep, $value)); else $result[$new_key] = $value; } } return $result; } $aaa = ['aaa' => 123,'bbbb' => ['eeee' => ['zzzz' => 'qqqq']],'cccc' => 789,'dddd'=>['kkkk' => 'wwww']]; print_r(arrayFlattenSep('/', $aaa));