json 불러와서 출력하는 부분인데요.

$json_str = '{    "result": {        "message": "성공",        "code": 9200,        "requestUrl": "/weather/summary?version=1&lat=37.4930444&lon=127.0137737"    },    "common": {        "alertYn": "Y",        "stormYn": "N"    },    "weather": {        "summary": [            {                "grid": {                    "latitude": "37.4876400000",                    "longitude": "126.9879200000",                    "city": "서울",                    "county": "서초구",                    "village": "방배4동"                },                "yesterday": {                    "sky": {                        "name": "맑음",                        "code": "SKY_Y01"                    },                    "precipitation": {                        "rain": "0.00",                        "snow": "0.00"                    },                    "temperature": {                        "tmax": "15.10",                        "tmin": "10.50"                    }                },                "today": {                    "sky": {                        "name": "맑음",                        "code": "SKY_D01"                    },                    "temperature": {                        "tmax": "15.10",                        "tmin": "10.50"                    }                },                "tomorrow": {                    "sky": {                        "name": "맑음",                        "code": "SKY_M01"                    },                    "temperature": {                        "tmax": "15.10",                        "tmin": "10.50"                    }                },                "dayAfterTomorrow": {                    "sky": {                        "name": "맑음",                        "code": "SKY_M01"                    },                    "temperature": {                        "tmax": "15.10",                        "tmin": "10.50"                    }                },                "timeRelease": "2013-11-0717: 00: 00"            }        ]    }}';$obj = json_decode($json_str); echo $obj->weather->summary[0]->yesterday->sky->name;