Hey all, kind of a first timer with JSON parsing and was wondering how I could parse this JSON and select the image URL based on the size value. Thanks ahead of time.

Code PHP:
"media": {
                        "photos": {
                            "photo": [
                                {
                                    "@size": "x",
                                    "$t": "http://photos.petfinder.com/photos/US/FL/FL286/25768801/FL286.25768801-1-x.jpg",
                                    "@id": "1"
                                },
                                {
                                    "@size": "fpm",
                                    "$t": "http://photos.petfinder.com/photos/US/FL/FL286/25768801/FL286.25768801-1-fpm.jpg",
                                    "@id": "1"
                                },
                                {
                                    "@size": "pn",
                                    "$t": "http://photos.petfinder.com/photos/US/FL/FL286/25768801/FL286.25768801-1-pn.jpg",
                                    "@id": "1"
                                },
                                {
                                    "@size": "pnt",
                                    "$t": "http://photos.petfinder.com/photos/US/FL/FL286/25768801/FL286.25768801-1-pnt.jpg",
                                    "@id": "1"
                                },
                                {
                                    "@size": "t",
                                    "$t": "http://photos.petfinder.com/photos/US/FL/FL286/25768801/FL286.25768801-1-t.jpg",
                                    "@id": "1"
                                }
                            ]
                        }