发出从getJSON数据传递变量到php

I have a jQuery getJSON that I want to pass some data to php. The weird thing is that I can't pass a var. In my code I have another area where this works ok, also if I hardcode the string also works ok, but if I put a valid var that is also working ok, is not working. Here is my code:I have a jQuery getJSON that I want to pass som