gistfile1.txt

    public function extractByChangeKeyToUnderscore($data, $column = [], $json = true, $multiDArray = false) {
        if (!$data) {
            return null;
        }
        $result = [];
        if ($multiDArray) {
            foreach ($data as $i => $value) {
                $result[$i] = $this->extractByChangeKeyToUnderscore($value, $json);
            }
        } else {
            foreach ($data as $key => $value) {
                if ($column) {
                    if (in_array($key, $column)) {
                        $result[Inflector::underscore($key)] = $value;
                    }
                } else {
                    $result[Inflector::underscore($key)] = $value;
                }
            }            
        }
        if ($json) {
            $result = json_encode($result);
        }
        return $result;
    }