How to modify the data in a row of php table

In PHP, we can modify the data in a row of the table through the following steps:

1. First, we need to connect to the database and query the data that needs to be modified. This query can be any kind of query, such as SELECT, UPDATE, etc.
2. After the query returns the result set, we can use a foreach loop or while loop to traverse the result set. During the loop, we can use an array or object to obtain the content of each row of data.
3. For the data that needs to be modified, we can store it in a variable and modify it. For example, we can modify the elements in an array and then save them back to the database.
4. Finally, we need to execute the SQL statement to save the modified data to the database. This operation can be accomplished through the UPDATE statement.

The following is a sample code that demonstrates how to modify data in a row of a table in PHP:

<?php
// 连接数据库
$conn = mysqli_connect('localhost', 'root', 'password', 'database');

// 查询需要修改的数据
$sql = "SELECT * FROM `users` WHERE `id` = 1";
$result = mysqli_query($conn, $sql);

// 遍历结果集，并获取需要修改的数据
while ($row = mysqli_fetch_assoc($result)) {
    $name = $row['name'];
    $email = $row['email'];
  
    // 对需要修改的数据进行修改
    $name = 'New Name';
    $email = 'newemail@example.com';
  
    // 执行 SQL 语句来保存修改后的数据
    $sql = "UPDATE `users` SET `name` = '$name', `email` = '$email' WHERE `id` = 1";
    mysqli_query($conn, $sql);
}

// 关闭数据库连接
mysqli_close($conn);
?>

In this example, we first connect to the database, and Query the data of the user with ID 1. We then get the name and email of this piece of data and modify it. After the modification is completed, we use the UPDATE statement to save the modified data back to the database.

It should be noted that this example only demonstrates how to modify the data in a certain row of the table. In actual use, we also need to perform security checks on the input data to ensure that it does not contain malicious code or SQL injection attacks. In addition, we also need to consider the issue of concurrent modifications to ensure the correctness and reliability of modification operations.

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