How can PHP be used to create a login page that restricts access to specific users?

To create a login page that restricts access to specific users, you can use PHP to validate user credentials against a database of authorized users. Upon successful login, you can set a session variable to track the user's authentication status and restrict access to certain pages based on this variable. 

<?php
session_start();

// Check if the user is already logged in
if(isset($_SESSION['username'])) {
    header("Location: dashboard.php");
    exit();
}

// Check if the form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = "admin";
    $password = "password";

    // Validate user credentials
    if($_POST['username'] == $username && $_POST['password'] == $password) {
        $_SESSION['username'] = $username;
        header("Location: dashboard.php");
        exit();
    } else {
        echo "Invalid username or password";
    }
}
?>

<!DOCTYPE html>
<html>
<head>
    <title>Login Page</title>
</head>
<body>
    <h2>Login</h2>
    <form method="POST" action="">
        <label for="username">Username:</label><br>
        <input type="text" id="username" name="username"><br>
        <label for="password">Password:</label><br>
        <input type="password" id="password" name="password"><br>
        <input type="submit" value="Login">
    </form>
</body>
</html>

Keywords

PHP login page access restriction user authentication session management

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