Add new data into PHP JSON string

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I was just searching for the solution to this and stumbled across this question (already one year old). The answers provided so far were not very helpful to me. So, hopefully this helps the next person.

The answer I was looking for was

$json = json_decode($data,true);

which returns the result in an array structure, not an object. Then, it is quite simple to add new values:

$json['foo'] = 'bar';

After this, the data can of course be returned into a string with json_encode().

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