JSON到PHP数组获取；试图获取“中非对象的属性”；错误

您好，我有这样的Json：

[{
    "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"]
        }
    }
}]

$msc = microtime(true);

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

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

   foreach($value['answerList']['gradeFour'] as $course){
        foreach($course as $val){
            echo $val;    
        }   
    }

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

}

我试图在foreach循环中打印课程答案

请输入以下代码：

<?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
?>

但是得到这个错误

注意：尝试在中获取非对象的属性 第50行的G:\xampp\htdocs\siec\string\u test.php注意：尝试获取 G:\xampp\htdocs\siec\string\u test.php联机中非对象的属性 50警告：中为foreach（）提供的参数无效 第50行的G:\xampp\htdocs\siec\string\u test.php

---

在第二个

foreach

循环中，

$value

是一个数组。因此，您必须将其与括号一起使用

[]

而不是

->

：

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

---

您的代码有两个问题：

• 首先，您必须使用括号而不是->

• 其次，您需要使用嵌套循环（两个for）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，您的完整代码如下所示：

[{
    "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"]
        }
    }
}]

$msc = microtime(true);

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

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

   foreach($value['answerList']['gradeFour'] as $course){
        foreach($course as $val){
            echo $val;    
        }   
    }

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

}

$msc=microtime（真）；
$array=（json_decode（$raw_str，true））；
foreach（$array作为$value）{
echo$value['id_number']；
回声“
”；
foreach（$value['answerList']['gradeFour']作为$course）{
foreach（课程名称为$val）{
echo$val；
}   
}
回音“
------------------------------”；
回声“
”；
}

第5行中的问题 必须将其解码为关联数组 阅读

检查下面的代码，它将帮助您更好地理解

 $array = json_decode($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>';

}

$array=json\u decode（$raw\u str）；
foreach（$array作为$value）{
echo$value->id\u编号；
回声“
”；
foreach（$value->answerList->grade4as$key=>$val）{
echo$key；
回声“；
印刷费（$val）；
回声“；
}
回音“
------------------------------”；
回声“
”；
}

开始使用

$value['id\u number']

，然后切换到对象符号访问（

$value->answerList

），可以使用其中一个（取决于

json\u decode（）

的第二个参数）这种方法对原始代码增加了太多的更改：这必须改变他获取

id\u number

的方式，以及他从json转换的方式。原始代码显然需要数组作为

json\u decode

的结果，因此转换代码的其他部分是错误的。此外，这个答案只是简单地丢弃了整个分数数组，他在没有被问到的时候添加了

pre

标签。谢谢你的回复。。。Solved@fischer伟大的您可以接受答案，作为下一位访客的指南。是否可以使用foreach（$value['answerList']['gradeFour']作为$course）{as foreach（$value['answerList'][0]作为$course）{因为四年级五年级的学生dynamic@fischer不，您不能使用数字访问命名数组。但是，您也可以在

answerList

上迭代。例如

foreach（$value['answerList']as$numberCourses）{

和在$numberCourses上迭代以获得$course，等等。