How to solve the problem that the php database hobby cannot be displayed

The solution to the problem that PHP database hobby cannot be displayed is: 1. Code to test whether the database connection is successful; 2. Ensure that the data is correctly retrieved from the database and that the row contains the "hobby" field; 3. Check whether the database connection is successful; Are there any spelling or grammatical errors when referencing the "hobby" field in the PHP code? 4. Make sure the variable is rendered into HTML output correctly and without any errors.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

In PHP, if the "hobby" field in the database cannot be displayed, you need to check the following aspects:

1. Whether the database connection is successful:

Make sure you have successfully connected to the database and selected the correct table. You can use the following code to test the database connection:

```php
$conn = mysqli_connect("localhost", "用户名", "密码", "数据库");
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
echo "连接成功";
```

2. Whether the data is retrieved from the database correctly:

Please make sure that you are retrieving data from the database correctly and that Row contains "hobby" field. You can use the following code to retrieve all the data and ensure that they are all present:

```php
$result = mysqli_query($conn, "SELECT * FROM 表名");
while($row = mysqli_fetch_assoc($result)) {
    echo "姓名：" . $row["name"]. " - 爱好：" . $row["hobby"]. "<br>";
}
```

3. Are there any spelling errors when referencing fields in the PHP code:

Please check that you are Are there any spelling mistakes or grammatical errors in the PHP code when referencing the "hobby" field.

4. Are variables referenced correctly in HTML output:

Please make sure you render variables correctly into HTML output without any errors. For example, make sure you use the correct variable names, don't have any syntax errors, etc. You can use the following code to output the value of the "hobby" field:

```php
<div>爱好：<?php echo htmlspecialchars($row[&#39;hobby&#39;]); ?></div>
```

If the above solutions still do not resolve the issue, please provide more details and relevant code samples to more closely analyze the root cause of the issue.

If the "hobby" field cannot be displayed, the data presentation may be incomplete or partially missing. This issue may affect the functionality of your application, cause user data loss, or other issues.

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