PHP json_encode函數(shù)為null

數(shù)據(jù):

{
                    "children": [
                        {
                            "children": [
                                
                            ],
                            "content": "{\"requestHeaders\":[],\"requestMethod\":\"GET\",\"dataType\":\"X-WWW-FORM-URLENCODED\",\"requestArgs\":[{\"children\":[],\"defaultValue\":\"0\",\"name\":\"start\",\"require\":\"false\",\"type\":\"string\",\"testValue\":\"\"},{\"children\":[],\"defaultValue\":\"1\",\"name\":\"count\",\"require\":\"false\",\"type\":\"string\",\"testValue\":\"\"}],\"description\":\"\",\"contentType\":\"JSON\",\"url\":\"https://mobile.mdaxue.com/bbs-forumdetail-48199.json\",\"responseArgs\":[],\"example\":\"{\\n    \\\"id\\\": \\\"48199\\\", \\n    \\\"name\\\": \\\"海報招貼\\\", \\n    \\\"collegeid\\\": \\\"tsinghua\\\", \\n    \\\"threadnum\\\": \\\"112\\\", \\n    \\\"newthreadnum\\\": \\\"0\\\", \\n    \\\"postnum\\\": \\\"4\\\", \\n    \\\"lastthread_at\\\": \\\"1494143370\\\", \\n    \\\"extra\\\": \\\"poster\\\", \\n    \\\"level\\\": 1, \\n    \\\"collegename\\\": \\\"清華大學\\\", \\n    \\\"subforums\\\": [\\n        {\\n            \\\"id\\\": \\\"48200\\\", \\n            \\\"parentid\\\": \\\"48199\\\", \\n            \\\"name\\\": \\\"租房\\\", \\n            \\\"extra\\\": \\\"poster\\\", \\n            \\\"newthreadnum\\\": \\\"0\\\", \\n            \\\"level\\\": 2\\n        }, \\n        {\\n            \\\"id\\\": \\\"48201\\\", \\n            \\\"parentid\\\": \\\"48199\\\", \\n            \\\"name\\\": \\\"講座\\\", \\n            \\\"extra\\\": \\\"poster\\\", \\n            \\\"newthreadnum\\\": \\\"0\\\", \\n            \\\"level\\\": 2\\n        }, \\n        {\\n            \\\"id\\\": \\\"48202\\\", \\n            \\\"parentid\\\": \\\"48199\\\", \\n            \\\"name\\\": \\\"活動\\\", \\n            \\\"extra\\\": \\\"poster\\\", \\n            \\\"newthreadnum\\\": \\\"0\\\", \\n            \\\"level\\\": 2\\n        }, \\n        {\\n            \\\"id\\\": \\\"48203\\\", \\n            \\\"parentid\\\": \\\"48199\\\", \\n            \\\"name\\\": \\\"賽事\\\", \\n            \\\"extra\\\": \\\"poster\\\", \\n            \\\"newthreadnum\\\": \\\"0\\\", \\n            \\\"level\\\": 2\\n        }, \\n        {\\n            \\\"id\\\": \\\"48205\\\", \\n            \\\"parentid\\\": \\\"48199\\\", \\n            \\\"name\\\": \\\"失物\\\", \\n            \\\"extra\\\": \\\"poster\\\", \\n            \\\"newthreadnum\\\": \\\"0\\\", \\n            \\\"level\\\": 2\\n        }, \\n        {\\n            \\\"id\\\": \\\"48206\\\", \\n            \\\"parentid\\\": \\\"48199\\\", \\n            \\\"name\\\": \\\"公益\\\", \\n            \\\"extra\\\": \\\"poster\\\", \\n            \\\"newthreadnum\\\": \\\"0\\\", \\n            \\\"level\\\": 2\\n        }, \\n        {\\n            \\\"id\\\": \\\"48207\\\", \\n            \\\"parentid\\\": \\\"48199\\\", \\n            \\\"name\\\": \\\"其他\\\", \\n            \\\"extra\\\": \\\"poster\\\", \\n            \\\"newthreadnum\\\": \\\"0\\\", \\n            \\\"level\\\": 2\\n        }\\n    ], \\n    \\\"admins\\\": null\\n}\",\"status\":\"有效\"}",
                            "id": "8Gbprvxm1",
                            "name": "獲取海報二級分類",
                            "parentId": "8GVhbjEbh",
                            "projectId": "LNJIh7zgQ",
                            "sort": 0,
                            "type": "sys.http"
                        }
                    ],
                    "id": "8GVhbjEbh",
                    "name": "海報",
                    "parentId": "LNJMNG5ul",
                    "projectId": "LNJIh7zgQ",
                    "sort": 5,
                    "type": "sys.folder"
}

$json = json_decode($json,1);
var_dump($json);

卻打印出了NULL,懵逼

回答

編輯回答

薄荷綠

![圖片上傳中...]
這一行出錯，
①{}兩側不要用""
{}是對象，用""包裹和里面的“”沖突格式亂掉了，"{"requestHeaders": 前兩個引號包裹的事 {
②把n什么的刪掉
③"的刪掉

"content": {"requestHeaders":[],"requestMethod":"GET","dataType":"X-WWW-FORM-URLENCODED","requestArgs":[{"children":[],"defaultValue":"0","name":"start","require":"false","type":"string","testValue":""},{"children":[],"defaultValue":"1","name":"count","require":"false","type":"string","testValue":""}],"description":"","contentType":"JSON","url":"https://mobile.mdaxue.com/bbs-forumdetail-48199.json","responseArgs":[],"example":{    "id": "48199",     "name": "海報招貼",     "collegeid": "tsinghua",     "threadnum": "112",     "newthreadnum": "0",     "postnum": "4",     "lastthread_at": "1494143370",     "extra": "poster",     "level": 1,     "collegename": "清華大學",     "subforums": [        {            "id": "48200",             "parentid": "48199",             "name": "租房",             "extra": "poster",             "newthreadnum": "0",             "level": 2        },         {            "id": "48201",             "parentid": "48199",             "name": "講座",             "extra": "poster",             "newthreadnum": "0",             "level": 2        },         {            "id": "48202",             "parentid": "48199",             "name": "活動",             "extra": "poster",             "newthreadnum": "0",             "level": 2        },         {            "id": "48203",             "parentid": "48199",             "name": "賽事",             "extra": "poster",             "newthreadnum": "0",             "level": 2        },         {            "id": "48205",             "parentid": "48199",             "name": "失物",             "extra": "poster",             "newthreadnum": "0",             "level": 2        },         {            "id": "48206",             "parentid": "48199",             "name": "公益",             "extra": "poster",             "newthreadnum": "0",             "level": 2        },         {            "id": "48207",             "parentid": "48199",             "name": "其他",             "extra": "poster",             "newthreadnum": "0",             "level": 2        }    ],     "admins": null},"status":"有效"},

2017年7月30日 02:25

編輯回答