Question

你好，我有这样的杰森：

[{
    "exam_code": "1",
    "name": "Name1",
    "surname": "Surname1",
    "father_name": "Fname1",
    "id_number": "211111",
    "district_number": "21",
    "school_number": "025",
    "gender": "F",
    "variant": "A",
    "grade": "4",
    "sector": "A",
    "foreign_language": "I",
    "answerList": {
        "gradeFour": {
            "lesson1": ["A", "C", "C", "C", "A", "A", "B", "B", " ", "C", "C", "B", "A", "C", "C", "B", "B", "C", "B", "A"],
            "lesson2": ["B", "A", " ", "C", " ", "B", " ", "B", "B", "C", " ", " ", "B", "A", "A", "A", "C", "A", "B", "B"],
            "lesson3": ["A", "C", "B", "B", "A", "A", "C", "A", "C", "C"],
            "lesson4": ["B", "B", "A", "B", "B"],
            "lesson5": ["B", "A", "A", "B", "B"],
            "lesson6": ["B", "A", "A", "B", "A", "B", "A", "A", "C", "B"]
        }
    }
}]

我正在尝试在foreach循环上打印课程答案。

尝试以下代码：

<?php
$msc = microtime(true);


$array = (json_decode($raw_str,true));

foreach($array as $value){
echo $value['id_number'];
    echo '<br/>';

   foreach($value -> answerList->gradeFour as $val){
        echo $val;    
  }

  echo '<br>---------------------------';
  echo '<br>';

}
$msc = microtime(true)-$msc;
echo ($msc * 1000) . ' ms'; // in millseconds
?>

但是收到此错误

注意：尝试获取非对象的属性第50行的G：\ xampp \ htdocs \ siec \ string_test.php注意：试图获取在线上G：\ xampp \ htdocs \ siec \ string_test.php中非对象的属性 50警告：为in中的foreach（）提供了无效的参数 G：\ xampp \ htdocs \ siec \ string_test.php在第50行

Answer 1

在第二个foreach循环中，$value是一个数组。因此，您必须使用方括号[]而不是->来使用它：

foreach($value['answerList']['gradeFour'] as $val) {

Answer 2

您的代码有两个问题：

首先，您必须使用方括号而不是->
第二，您需要使用嵌套循环（两个fors）来打印成绩，因为您有多个课程（另一个数组）的多个成绩（一个数组）。

因此您的完整代码将如下所示：

<script src="vendor/unisharp/laravel-ckeditor/ckeditor.js"></script>
<textarea id="editor1" ></textarea>

 <script>
     CKEDITOR.replace( 'editor1' );
 </script>

Answer 3

第5行中的问题您必须将其解码为关联数组阅读json_decode

检查下面的代码，它将帮助您更加了解

 $array = json_decode($raw_str);

 foreach($array as $value){
    echo $value->id_number;
    echo '<br/>';

    foreach($value->answerList->gradeFour as $key => $val){
       echo $key;
       echo "<pre>";
       print_r($val);
       echo "</pre>";

    }

    echo '<br>---------------------------';
    echo '<br>';

}

JSON至PHP数组获取“尝试获取非对象的属性”错误

3 个答案: