How can a PHP script be modified to allow users to log in with a specific code instead of a username and password?

To allow users to log in with a specific code instead of a username and password, you can modify the login script to check the input code against a predefined value. This can be done by creating a form with a single input field for the code and then comparing the input code with the predefined code in the PHP script. 

<?php
// Predefined code for login
$valid_code = "12345";

// Check if the form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $input_code = $_POST['code'];

    // Check if the input code matches the valid code
    if ($input_code == $valid_code) {
        // Code is correct, allow access
        echo "Login successful!";
    } else {
        // Code is incorrect, show error message
        echo "Invalid code. Please try again.";
    }
}
?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <label for="code">Enter Code:</label>
    <input type="text" id="code" name="code" required>
    <button type="submit">Login</button>
</form>

Keywords

PHP authentication login security code-based authentication

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