PHP adding to array after JSON encoding

Question

I'm encoding a very basic array like this.

$c['A']=NULL;

$c=json_encode($c);

I later want to decode the json and add a new key

$c=json_decode($c);

$c[B]=NULL;

The problem is that $c is now an object.

Answer 1

json_decode() is returning PHP Object. You need 2nd parameter if you want it to be array:

$c=json_decode($c, true);

look:http://php.net/manual/en/function.json-decode.php

When TRUE, returned objects will be converted into associative arrays.

Answer 2

Use $c as an object:

$c->B = NULL;