PHP Json数据解析问题

想要把这些数据打印下来，反正就是没成功

想要打印的结果:
xxx考试
满分750
得分565

xxx考试
满分850
得分565

{"code":0,"msg":"获取一名学生成绩趋势摘要信息成功","data":[{"examId":"1420702","name":"南平市2020-2021学年第二学期高一质量检测","type":2,"score":393.5,"time":1625414400000,"manfen":750,"classRank":-2,"level":11.78,"stage":"E","className":"12","teacherComment":2,"classRankType":5},{"examId":"1433279","name":"建瓯一中高一三科","type":2,"score":113,"time":1625414400000,"manfen":200,"classRank":-2,"level":55.93,"stage":"C","className":"12","teacherComment":2,"classRankType":5},{"examId":"1425560","name":"高一","type":5,"score":24,"time":1624896000000,"manfen":250,"classRank":-2,"level":100,"stage":"A","className":"12","teacherComment":2,"classRankType":5},{"examId":"1365292","name":"2020-2021（下）建瓯一中高一期中考试","type":1,"score":565.5,"time":1621353600000,"manfen":1050,"classRank":-2,"level":30.38,"stage":"D","className":"12","teacherComment":2,"classRankType":5},{"examId":"1296366","name":"建瓯一中2020-2021下学年级第一次月考（高一）","type":3,"score":611.5,"time":1617638400000,"manfen":1050,"classRank":-2,"level":40.02,"stage":"C","className":"12","teacherComment":2,"classRankType":5},{"examId":"1187511","name":"南平市2020—2021学年第一学期高一质量检测","type":2,"score":637.5,"time":1611590400000,"manfen":1050,"classRank":-2,"level":39.8,"stage":"D","className":"12","teacherComment":2,"classRankType":5},{"examId":"1157390","name":"2020-21学年第一学期金太阳卷高一联考","type":3,"score":657,"time":1608134400000,"manfen":1050,"classRank":-2,"level":39.42,"stage":"D","className":"12","teacherComment":2,"classRankType":5},{"examId":"1141624","name":"建瓯一中2020-2021上学年高一期中考试","type":1,"score":554,"time":1605628800000,"manfen":1050,"classRank":-2,"level":11.23,"stage":"E","className":"12","teacherComment":2,"classRankType":5},{"examId":"1096981","name":"建瓯一中2020-2021学年上学期高一月考","type":3,"score":627.5,"time":1602691200000,"manfen":1050,"classRank":-2,"level":42.24,"stage":"C","className":"12","teacherComment":2,"classRankType":5}]}

php json解析：

json对象想要解析出来，需要用到 json_decode($html, true) 这样的写法，返回将会是一个数组。

关于数组中提取部分字段和值问题：

从一个数组中想要提出所有的name字段值，需要用到php方法 array_column()

结果截图：

源码：

<?php

$str = '{"code":0,"msg":"获取一名学生成绩趋势摘要信息成功","data":[{"examId":"1420702","name":"南平市2020-2021学年第二学期高一质量检测","type":2,"score":393.5,"time":1625414400000,"manfen":750,"classRank":-2,"level":11.78,"stage":"E","className":"12","teacherComment":2,"classRankType":5},{"examId":"1433279","name":"建瓯一中高一三科","type":2,"score":113,"time":1625414400000,"manfen":200,"classRank":-2,"level":55.93,"stage":"C","className":"12","teacherComment":2,"classRankType":5},{"examId":"1425560","name":"高一","type":5,"score":24,"time":1624896000000,"manfen":250,"classRank":-2,"level":100,"stage":"A","className":"12","teacherComment":2,"classRankType":5},{"examId":"1365292","name":"2020-2021（下）建瓯一中高一期中考试","type":1,"score":565.5,"time":1621353600000,"manfen":1050,"classRank":-2,"level":30.38,"stage":"D","className":"12","teacherComment":2,"classRankType":5},{"examId":"1296366","name":"建瓯一中2020-2021下学年级第一次月考（高一）","type":3,"score":611.5,"time":1617638400000,"manfen":1050,"classRank":-2,"level":40.02,"stage":"C","className":"12","teacherComment":2,"classRankType":5},{"examId":"1187511","name":"南平市2020—2021学年第一学期高一质量检测","type":2,"score":637.5,"time":1611590400000,"manfen":1050,"classRank":-2,"level":39.8,"stage":"D","className":"12","teacherComment":2,"classRankType":5},{"examId":"1157390","name":"2020-21学年第一学期金太阳卷高一联考","type":3,"score":657,"time":1608134400000,"manfen":1050,"classRank":-2,"level":39.42,"stage":"D","className":"12","teacherComment":2,"classRankType":5},{"examId":"1141624","name":"建瓯一中2020-2021上学年高一期中考试","type":1,"score":554,"time":1605628800000,"manfen":1050,"classRank":-2,"level":11.23,"stage":"E","className":"12","teacherComment":2,"classRankType":5},{"examId":"1096981","name":"建瓯一中2020-2021学年上学期高一月考","type":3,"score":627.5,"time":1602691200000,"manfen":1050,"classRank":-2,"level":42.24,"stage":"C","className":"12","teacherComment":2,"classRankType":5}]}';

$array = json_decode($str, true);

$data = $array['data'];

// 方法一
foreach ($data as $k => $v) {
    echo $v['name'] . PHP_EOL;
    echo '满分' . $v['manfen'] . PHP_EOL;
    echo '得分' . $v['score'] . PHP_EOL;
}

//方法二
$name = array_column($data,'name');         //将会提出所有的nama值
$manfen = array_column($data,'manfen');     //将会提出所有满分的值
$score = array_column($data,'score');       //将会提出所有的得分值

如果你这个数据室前端传递过来的json数据的话，json_decode函数可以把字符串格式的json数据转换为数组

$data_arr = json_decode($data,true); //加true代表json解析成数组不使用表示json解析成对象（对象要用->获取数组使用[]获取
//这里使用 echo 输出 pre标签后可以更直观
print_r($data);//打印后你看完就知道怎么具体使用了

json_decode($html, true); 加了true后，返回的结果是一个数组

$obj = json_decode($html, true);
$name = $obj['data'][0]['name'];

json_decode 转换成数组的格式