What are the key components and steps involved in creating a functional website login/logout and registration script using PHP?

To create a functional website login/logout and registration script using PHP, you will need to have a database to store user information, create HTML forms for registration and login, validate user input, and handle sessions to keep track of logged-in users. 

<?php
session_start();

// Database connection
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "myDB";

$conn = new mysqli($servername, $username, $password, $dbname);

// Registration script
if(isset($_POST['register'])){
    $username = $_POST['username'];
    $password = $_POST['password'];

    $sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
    $conn->query($sql);
}

// Login script
if(isset($_POST['login'])){
    $username = $_POST['username'];
    $password = $_POST['password'];

    $sql = "SELECT * FROM users WHERE username='$username' AND password='$password'";
    $result = $conn->query($sql);

    if($result->num_rows > 0){
        $_SESSION['username'] = $username;
        header("Location: dashboard.php");
    } else {
        echo "Invalid username or password";
    }
}

// Logout script
if(isset($_POST['logout'])){
    session_destroy();
    header("Location: index.php");
}
?>

Keywords

PHP website login logout registration

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