PHP中的非法字符串偏移量错误

我将这些对象发送到服务器以获取记录并保存它。但它给了我下面给定的错误

array(3) {
[0]=>
array(1) {
    ["answer"]=>
    string(218) "{"id":"19","question_id":"10","answer_text":"Please note that we also maintain you:",  
"iscorrect":"1",
"created_at":"2014-06-07 07:52:12",  
"updated_at":"2014-06-07 07:52:12"}"
  }
  [1]=>
 array(1) {
   ["answer"]=>
    string(218) "{"id":"20","question_id":"10","answer_text":"Please note that we also maintain the following pages and support forums to help you:",  
"iscorrect":"1",
"created_at":"2014-06-07 07:52:13",  
"updated_at":"2014-06-07 07:52:13"}"
 }
[2]=>
array(1) {
  ["answer"]=>
  string(218) "{"id":"21","question_id":"10",  
  "answer_text":"Please note that we also maintain the following pages and support forums to help you:","iscorrect":"0","created_at":"2014-06-07 07:52:13","updated_at":"2014-06-07 07:52:13"}"
}
}

{"error":{"type":"ErrorException","message":"Illegal string offset     'id'","file":"\/home\/learnomatics\/laravel\/mobillz_mlmalp\/app\/controllers\/QuizController.php","line":379}}

我试图得到如下值

$answers=Input::get('answers');
var_dump($answers);
foreach ($answers as $answer) {
    if(isset($answer['answer'])){
        quiz_que_ans_id=$answer['answer']['id'];
}
}

---

这里您的答案包含一个json字符串。在获取任何密钥之前对其进行解码。 试试这个：

foreach ($answers as $answer) {
    if(isset($answer['answer'])){
        $ans = json_decode($answer['answer'],true);
        if(is_array($ans)){
            quiz_que_ans_id=$ans['id']; 
        }
    }
}

---

$answer['answer']

变量是一个包含JSON编码数据的字符串；要访问该文件，您需要首先对其进行解码：

$data = json_decode($answer['answer'], true);
$quiz_queue_ans_id = $data['id']; // work with decoded data

---

尝试以下操作，将照片传递到

Form:：file

facade

{!! Form::file('photo', $user_master->photo, ['class' => 'control-label input-sm', 'type'=>'file', 'accept'=>'image/*']) !!}

而不是

{!! Form::file('photo', null, ['class' => 'control-label input-sm', 'type'=>'file', 'accept'=>'image/*']) !!}`

---

您需要解码json字符串以访问该字符串中的值。您从$answer中得到了什么？？请打印（$answer）…我是拉雷维尔的新手，所以你能告诉我如何解码json吗？使用哪种方法？您不需要Laravel来解码JSON，只需使用

JSON\u decode（）

.Array（=>{“id”：“19”，“问题id”：“10”，“答案文本”：“请注意，我们还维护以下页面和支持论坛来帮助您：”，“iscorrect”：“1”，“创建时间”：“2014-06-07 07:52:12”，“更新时间”：“2014-06-07:07:52:12”）我在打印（答案）后得到了这个；它不会给出错误，但也不会获取值。表示每次显示值=null时，它不返回数组。如果我检查（is_array），它将返回false。如果不检查此情况，它将工作