How can a PHP beginner create a login account system with user registration and centralized data retrieval?

To create a login account system with user registration and centralized data retrieval in PHP, you can use a combination of HTML forms for user input, PHP scripts to handle form submissions, and a MySQL database to store user information. 

<?php
// Establish a connection to the MySQL database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "dbname";
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// User registration form handling
if(isset($_POST['register'])){
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // Insert user data into the database
    $sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
    $conn->query($sql);
    echo "User registered successfully!";
}

// User login form handling
if(isset($_POST['login'])){
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // Retrieve user data from the database
    $sql = "SELECT * FROM users WHERE username='$username' AND password='$password'";
    $result = $conn->query($sql);
    
    if($result->num_rows > 0){
        echo "Login successful!";
    } else {
        echo "Invalid username or password!";
    }
}

// Centralized data retrieval
$sql = "SELECT * FROM users";
$result = $conn->query($sql);

if($result->num_rows > 0){
    while($row = $result->fetch_assoc()){
        echo "Username: " . $row['username'] . "<br>";
    }
}

// Close the database connection
$conn->close();
?>

Keywords

PHP login system user registration data retrieval centralized.

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