How can PHP developers troubleshoot and resolve issues related to login processes on websites?

Issue: PHP developers can troubleshoot and resolve issues related to login processes on websites by checking the database connection, verifying user input validation, and ensuring proper session handling. 

// Check database connection
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Validate user input
$username = $_POST['username'];
$password = $_POST['password'];

// Sanitize input
$username = mysqli_real_escape_string($conn, $username);
$password = mysqli_real_escape_string($conn, $password);

// Query database for user credentials
$sql = "SELECT * FROM users WHERE username='$username' AND password='$password'";
$result = $conn->query($sql);

if ($result->num_rows == 1) {
    // Start session and set user as logged in
    session_start();
    $_SESSION['username'] = $username;
    // Redirect user to dashboard
    header("Location: dashboard.php");
} else {
    echo "Invalid username or password";
}

$conn->close();

Keywords

Authentication PHP sessions password hashing CSRF protection error handling

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