src/Util/CurveArray.php
public static function nest(array $data, $seperator = '_')
    {
        if (self::isAssoc($data)) {
            $result = new \stdClass();

            foreach ($data as $key => $value) {
                if (($pos = strpos($key, $seperator)) !== false) {
                    $subKey = substr($key, 0, $pos);
                    $name   = substr($key, $pos + 1);

                    if (!isset($result->{$subKey})) {
                        $result->{$subKey} = self::nest(self::getParts($data, $subKey . $seperator), $seperator);
                    }
                } else {
                    $result->{$key} = $value;
                }
            }

            return $result;
        } else {
            $result = [];

            foreach ($data as $value) {
                $result[] = self::nest($value, $seperator);
            }

            return $result;
        }
    }
public static function nest(array $data, $seperator = '_')
    {
        if (self::isAssoc($data)) {
            $result = new \stdClass();

            foreach ($data as $key => $value) {
                if (($pos = strpos($key, $seperator)) !== false) {
                    $subKey = substr($key, 0, $pos);
                    $name   = substr($key, $pos + 1);

                    if (!isset($result->{$subKey})) {
                        $result->{$subKey} = self::nest(self::getParts($data, $subKey . $seperator), $seperator);
                    }
                } else {
                    $result->{$key} = $value;
                }
            }

            return $result;
        } else {
            $result = [];

            foreach ($data as $value) {
                $result[] = self::nest($value, $seperator);
            }

            return $result;
        }
    }
Converts a flat array into a nested object using a seperator

@param array $data
@param string $seperator
@return \stdClass