How can PHP be used to create a password-protected area and display complete web content upon successful login?

To create a password-protected area in PHP, you can use a combination of HTML forms for user input, PHP for processing the login credentials, and session variables to maintain the user's login status. Upon successful login, you can display the complete web content by checking the session variable and showing the protected content accordingly. 

<?php
session_start();

$valid_username = "admin";
$valid_password = "password";

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

    if ($username == $valid_username && $password == $valid_password) {
        $_SESSION["loggedin"] = true;
    } else {
        echo "Invalid username or password";
    }
}

if (isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true) {
    // Display complete web content
    echo "Welcome to the password-protected area!";
} else {
    // Display login form
    ?>
    <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
        Username: <input type="text" name="username"><br>
        Password: <input type="password" name="password"><br>
        <input type="submit" value="Login">
    </form>
    <?php
}
?>

Keywords

PHP password protection web content login authentication

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