How to use PHP and forms to change passwords

With the rapid development of network technology, people are increasingly relying on various websites and applications. On different websites and applications, we need to set different passwords to protect the security of our accounts. However, if you need to change your password frequently, it can become a hassle. Fortunately, many websites and applications provide the function of changing passwords, and this article will teach you how to use PHP and forms to implement the function of changing passwords.

1. Confirm user identity

Before implementing the password modification function, you first need to confirm the user's identity to ensure that only authorized users can modify their passwords. An easy way is to use the login feature. When users log in, they are authorized to use protected features of the website, including password changes. Therefore, before creating a password change form, you should ensure that the user is logged in and authorized.

2. Create a form

In this example, we will use a form to allow the user to enter a new password. We will create a form with the following fields:

• Current Password
• New Password
• Confirm New Password

The user must be correct You must enter your current password to change your password. The New Password and Confirm New Password fields allow the user to set a new password and ensure that both are exactly the same.

Here is a basic HTML form example that you can use as a starting point:

<form method="post" action="update_password.php">

  <label for="current_password">Current Password:</label>
  <input type="password" id="current_password" name="current_password">

  <label for="new_password">New Password:</label>
  <input type="password" id="new_password" name="new_password">

  <label for="confirm_password">Confirm New Password:</label>
  <input type="password" id="confirm_password" name="confirm_password">

  <button type="submit">Update Password</button>

</form>

3. Handling form submission

Once the user submits the password change form, you need to use PHP to handle the submitted data. First, you need to collect the values ​​of the form fields and ensure that the user has entered the current password correctly:

$current_password = isset($_POST['current_password']) ? $_POST['current_password'] : '';
$new_password = isset($_POST['new_password']) ? $_POST['new_password'] : '';
$confirm_password = isset($_POST['confirm_password']) ? $_POST['confirm_password'] : '';

if (!$current_password) {
  echo 'Current password is required.';
  exit;
}

// Continue processing form...

Next, you need to determine whether the new password and confirmation password entered by the user are exactly the same:

if ($new_password !== $confirm_password) {
  echo 'New passwords do not match.';
  exit;
}

// Continue processing form...

Finally, you need to use the correct logic to check if the current password is correct, and if so, update the user password with the new password:

// Check current password against stored password
if (!password_verify($current_password, $stored_password)) {
  echo 'Incorrect current password.';
  exit;
}

// Update password
$new_password_hash = password_hash($new_password, PASSWORD_DEFAULT);
$update_password_query = "UPDATE users SET password = '$new_password_hash' WHERE id = $user_id";
// Execute query...

In the above code, we use the password_verify() function to compare the user submissions Whether the current password matches the password stored in the database. If the passwords match, the new password is hashed using the password_hash() function, which hashes the password using the current default PHP hashing algorithm, and then stores the new hashed password into the database.

4. Complete password modification

If the form is submitted successfully and the current password is verified successfully, you can update the password in the database with the new password. Once this is done, show the user a success message or redirect them to another page:

// Update password
$new_password_hash = password_hash($new_password, PASSWORD_DEFAULT);
$update_password_query = "UPDATE users SET password = '$new_password_hash' WHERE id = $user_id";
// Execute query...

// Password updated successfully
echo 'Password updated successfully.';

Summary

In this article, we showed you how to implement passwords through PHP and forms Modified functionality. We demonstrated how to create a password change form using HTML and PHP code, with the correct logic to check and update user passwords. When you write such functionality, make sure to follow best practices such as using appropriate password hashing algorithms, avoiding storing passwords in clear text, allowing only authorized users to access password modification pages, etc.

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