i am currently digging into plugin development.
So question is, is there a easy way, to extract a specified extra_field and convert it ato a php variable or array?

i already tried json_decode with the mysql statement, but that didn't work at all.

Me too, looking for any way to develop an audio/mp3 plugin + small booking plugin

Did you managed to find a solution for this?

I'm also needing this for json output