Decode text into readable string from JSON

I am importing events from a calendar from the JSON file. Quotes and special characters are encoded like this in the JSON file: \u201cCasta Diva\u201d \u2013 I am decoding the JSON feed into an array using PHP json_decode, and the resulting text looks like this: “Casta Diva” – I want to end up with text like this when it is posted to the page: “Casta Diva” – I am not able to change the JSON feed and need someone to explain how to make the conversion into human readable text.