Login Form In PHP Code

Certainly! Here's a basic example of a login form in PHP:

1. HTML Form:
```html
<form method="POST" action="login.php">
  <label for="username">Username:</label>
  <input type="text" id="username" name="username" required>

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

  <button type="submit">Log in</button>
</form>
```

2. PHP Code (login.php):
```php
<?php
  // Retrieve user input from the form
  $username = $_POST['username'];
  $password = $_POST['password'];

  // Check if the username and password are valid
  // You would typically validate against a database or external authentication system
  if ($username === 'admin' && $password === 'password') {
    // Valid credentials, redirect to a protected page
    header('Location: welcome.php');
    exit();
  } else {
    // Invalid credentials, display an error message
    echo "Invalid username or password";
  }
?>
```

In this example, the form's `action` attribute points to `login.php`. The PHP code in `login.php` retrieves the values entered in the form's `username` and `password` fields using the `$_POST` superglobal array. You can then perform the necessary validation against a database or other authentication system. If the credentials are valid, you can redirect the user to a protected page (`welcome.php` in this case). Otherwise, you can display an error message.

Please note that this is just a basic example to illustrate the concept of a login form. In a real-world scenario, you should always handle user input validation, protect against SQL injection or other security vulnerabilities, and store passwords securely by hashing them, among other best practices.

Let me know if you have any further questions!

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