see #732 Encoding the extra fields so it can be stored in the XML

[ernestob]

Hi @peterkeung and @pkamps,

Can you review this?
This is fixing the issue #732.

[pkamps]

Hi Ernesto,

could you use 'CDATA' instead of the json encoding?

I believe it's better to stick with a single format (xml) and not use a combination of 2 formats XML and JSON.

[ernestob]

Hi @pkamps, the issue is that $dom->createTextNode() is expecting a string as parameter; the value of $content['extra_fields'] is an array.

To solve this issue, we need to create the whole array structure in XML or serialize the array information, which is what I am doing here.

[pkamps]

Ah ok, that makes it more complicated.

If it's not too complex, we could consider to make sure $content['extra_fields'] is always an array. Then turn that array into XML. But if that's very complex the json en/decode method is OK to me.