PHP json_encode函数为null

Question

数据: { "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\\\": \\\"海报招贴\\\", \\n \\\"collegeid\\\": \\\"tsinghua\\\", \\n \\\"threadnum\\\": \\\"112\\\", \\n \\\"newthreadnum\\\": \\\"0\\\", \\n \\\"postnum\\\": \\\"4\\\", \\n \\\"lastthread_at\\\": \\\"1494143370\\\", \\n \\\"extra\\\": \\\"poster\\\", \\n \\\"level\\\": 1, \\n \\\"collegename\\\": \\\"清华大学\\\", \\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\\\": \\\"讲座\\\", \\n \\\"extra\\\": \\\"poster\\\", \\n \\\"newthreadnum\\\": \\\"0\\\", \\n \\\"level\\\": 2\\n }, \\n {\\n \\\"id\\\": \\\"48202\\\", \\n \\\"parentid\\\": \\\"48199\\\", \\n \\\"name\\\": \\\"活动\\\", \\n \\\"extra\\\": \\\"poster\\\", \\n \\\"newthreadnum\\\": \\\"0\\\", \\n \\\"level\\\": 2\\n }, \\n {\\n \\\"id\\\": \\\"48203\\\", \\n \\\"parentid\\\": \\\"48199\\\", \\n \\\"name\\\": \\\"赛事\\\", \\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": "获取海报二级分类", "parentId": "8GVhbjEbh", "projectId": "LNJIh7zgQ", "sort": 0, "type": "sys.http" } ], "id": "8GVhbjEbh", "name": "海报", "parentId": "LNJMNG5ul", "projectId": "LNJIh7zgQ", "sort": 5, "type": "sys.folder" } $json = json_decode($json,1); var_dump($json); 却打印出了NULL,懵逼

Answer 1

。。。你试着把 content 这部分内容改一下试试？ 把它换成 html 的写法特别是特殊标签。很明显是你转译符的原因，然后导致 json 字符串不正确，函数解析不出来。

Answer 2

content 里的内容有问题