How can the use of MySQL databases improve the functionality and efficiency of an event calendar created with PHP?

Using MySQL databases can improve the functionality and efficiency of an event calendar created with PHP by allowing for easy data storage, retrieval, and manipulation. By storing event details in a structured database, you can efficiently query and display events based on various criteria such as date, location, or category. This can streamline the process of adding, updating, and deleting events, as well as providing a more scalable solution for managing a large number of events.

// Connect to MySQL database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "calendar";

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

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

// Query database for events
$sql = "SELECT * FROM events ORDER BY event_date";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "Event: " . $row["event_name"]. " - Date: " . $row["event_date"]. "<br>";
    }
} else {
    echo "No events found.";
}

$conn->close();