Question

我有这部分代码：

........

$topic_name = "";

........

function getAllTopics() {
    global $conn;
    $sql = "SELECT * FROM topics";
    $result = mysqli_query($conn, $sql);
    $topics = mysqli_fetch_assoc($result);
    return $topics;
}

我遇到类似

的错误

“ PHP警告：行中的字符串偏移量'name'非法...”

前端的代码部分是：

<tbody>
    <?php foreach ($topics as $key => $topic): ?>
    <tr class="odd gradeX">
    <th><?php echo $key + 1; ?></th>
    <th><?php echo $topic['name']; ?></th>
    </tr>
</tbody>

我在做什么错？

Answer 1

我可以看到您现有代码和逻辑的许多问题。

否1.缺少<? endforeach; ?>的循环foreach
否2.在使用getAllTopics()之前不调用$topics foreach循环中的变量。
否3. mysqli_fetch_assoc()提取 a 结果行作为关联数组，而不是表中的所有行。

我想您可以略微修改现有代码，并以这种方式进行[未经测试，但希望您明白我的意思]

function getAllTopics() {
    global $conn;
    $sql = "SELECT * FROM topics";
    $result = mysqli_query($conn, $sql);
    $result = mysqli_fetch_assoc($result);
    while ($row = mysql_fetch_assoc($result)) { 
      $topics[] = $row;  // this will get every single row from table result and push it to $topics array.
    } 
    return $topics;
}


<tbody>
    <?php 
    $topics =  getAllTopics(); // this will get all the topics 
    foreach ($topics as $key => $topic): ?>
     <tr class="odd gradeX">
       <th><?php echo $key + 1; ?></th>
       <th><?php echo $topic['name']; ?></th>
     </tr>
    <? endforeach; ?> // this is the missing endforeach; syntax
</tbody>

非法字符串偏移量的问题

1 个答案: