How can PHP be used to implement a simple login system without a database?

To implement a simple login system without a database, you can store user credentials in an associative array within your PHP code. When a user attempts to log in, you can compare the provided username and password with the values stored in the array. If they match, you can set a session variable to indicate that the user is logged in. 

<?php

// User credentials stored in an associative array
$users = [
    'username' => 'password'
];

session_start();

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = $_POST['username'];
    $password = $_POST['password'];

    if (isset($users[$username]) && $users[$username] === $password) {
        $_SESSION['logged_in'] = true;
        echo 'Login successful!';
    } else {
        echo 'Invalid username or password';
    }
}

?>

<form method="post">
    <input type="text" name="username" placeholder="Username">
    <input type="password" name="password" placeholder="Password">
    <button type="submit">Login</button>
</form>

Keywords

PHP session management password hashing form validation authentication

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