无法从JSON数组获取数据

Question

试着学习JSON。做一些简单的练习，但无法通过这个练习。我重新看了30遍这个教程。有什么指示吗？

以下是JSON：

{
  "name": "Username",
  "profile_name": "profile_username",
  "profile_url": "http://myapi.net/profile_username"
  "courses": [
    { "name": "English 340" },
    { "name": "History 202" },
    { "name": "Underwater Basket Weaving" }
  ]
}

它位于一个名为$JSON_array的变量中，这是我试图使用的foreach循环，用于提取课程名称并将其放入无序列表中。

<ul>
  <?php for( $i = 0; $i < count($JSON_array->courses); $i++ ): ?>
    echo '<li>';
    echo $JSON_array->{'courses'}[$i]->{'name'};
    echo '</li>';  
  <?php endfor; ?>
</ul>

它什么都不做..。我的源代码显示空列表项

Answer 1

你错过了,之后的profile_url

$json = '{
  "name": "Username",
  "profile_name": "profile_username",
  "profile_url": "http://myapi.net/profile_username",
  "courses": [
    { "name": "English 340" },
    { "name": "History 202" },
    { "name": "Underwater Basket Weaving" }
  ]
}';



$arr = json_decode($json);
?>

<ul>
  <?php for( $i = 0; $i < count($arr->courses); $i++ ): 
    echo '<li>';
    echo $arr->{'courses'}[$i]->{'name'};
    echo '</li>';  
  endfor; ?>
</ul>

Answer 2

试试这个：

$json = '{"name": "Username","profile_name": "profile_username","profile_url": "http://myapi.net/profile_username",
"courses": [
    { "name": "English 340" },
    { "name": "History 202" },
    { "name": "Underwater Basket Weaving" }
  ]
}';//comma was missing after profile_url

$arr = json_decode($json,true);//encode as an associative array

<ul>
 <?php
  foreach($arr['courses'] as $course){
    echo '<li>';
    echo $course['name'];
    echo '</li>';  
  }
 ?>
</ul>

Answer 3

尝尝这个

<ul>
    <?php foreach($JSON_array->courses as $course): ?>
        echo '<li>';
        echo $course->name;
        echo '</li>';  
    <?php endforeach; ?>
</ul>

更新:此外，您的JSON是无效的！！"profile_url": "http://myapi.net/profile_username"您在该行末尾缺少逗号