How to change password on php website

PHP is a scripting language widely used in website development. Many websites use PHP as the backend language. Changing passwords is a basic operation in PHP websites, especially when confidential information needs to be protected, such as personal accounts, bank accounts, etc. This article will introduce how to change the password in the PHP website to ensure the security of the account.

1. Confirm original password

Before changing the password, you must confirm the original password. In PHP, you can use SESSION to realize the function of confirming the original password. SESSION is a mechanism for saving user information on the server side. It can be used to store user login information and some key information of the user, such as passwords.

Before using SESSION, you need to enable SESSION first. You can use the following code at the beginning of the PHP script:

session_start();

When using SESSION, first save the user password in the SESSION variable, as shown below:

$_SESSION['password'] = $password;

When you need to confirm the user password, you can read the password information from SESSION, as shown below:

if ($_SESSION['password'] == $user_input_password) {
    // 用户密码验证通过，接下来进行密码修改操作
}

2. Change password

Through SESSION After verifying the user's original password, you can modify the password. In PHP, there are many ways to change passwords, and you can use databases and other methods to modify them.

2.1 Use the database to change the password

In PHP, it is a common practice to use a database to store user information. When using a database, you need to connect to the database and perform database operations. The following is an example of changing the password:

// 连接数据库
$con = mysqli_connect("localhost","username","password","database");

// 检查连接是否成功
if (mysqli_connect_errno()) {
  echo "连接失败: " . mysqli_connect_error();
}

// 获取需要修改密码的用户信息
$sql = "SELECT * FROM user WHERE id=1";
$result = mysqli_query($con,$sql);
$row = mysqli_fetch_array($result);

// 修改用户密码
$new_password = "new_password";
$sql = "UPDATE user SET password='" . $new_password . "' WHERE id=1";
mysqli_query($con,$sql);

// 关闭数据库连接
mysqli_close($con);

2.2 Changing the password without using a database

If the website is small and does not require a database, you can also use a simple method to change the password. The following is a sample program:

// 读取文件内容
$file = fopen("password.txt", "r") or die("无法打开文件！");
$password = fread($file, filesize("password.txt"));
fclose($file);

// 写入新密码
$file = fopen("password.txt", "w") or die("无法打开文件！");
$new_password = "new_password";
fwrite($file, $new_password);
fclose($file);

The above program obtains the user password by reading the password.txt file, and then writes the new password to the same file. This method is a simple and feasible way to change the password.

3. Security considerations

In PHP websites, password protection is very important, so the process of changing the password must also be safe. The following are some security considerations:

3.1 Prevent SQL injection

When using the database to change the password, you need to pay attention to SQL injection issues. In order to prevent SQL injection, the following measures need to be taken:

• Use parameterized queries. PHP provides two methods: PDO and mysqli to implement parameterized queries;
• Convert special characters righteous processing.

3.2 Use encryption to store passwords

When storing passwords, use encryption to process the password to prevent the original password from being leaked. Common encryption methods include MD5, sha256, etc.

3.3 Do not display user passwords in HTML forms

In HTML forms, do not display user passwords directly to avoid password theft. You should set the input box type to "password" and then use CSS to control the style.

<input type="password" name="password">

3.4 Add security verification

In the process of changing the password, you can add some additional security verification, such as entering verification code, sending email verification, etc.

To sum up, it is very important to change the password of the PHP website and it must be safe, simple and efficient. By using SESSION to confirm the original password, and using a database or not using a database to change the password, etc., you can achieve the effect of changing the password while ensuring security.

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