Notice: Array to string conversion

[ayaou]

The $v variable can be an array

https://github.com/fergusean/nusoap/blob/463c772ae805aed7f396d89e6dce1dc0ce4c038b/lib/class.wsdl.php#L1550

[ayaou]

This can be handled like this

$this->debug(sprintf('serializing array element: %s, %s of type: %s', $k, json_encode($v), $typeDef['arrayType']));