How does the installation of MySQLi affect the functionality of both procedural and object-oriented interfaces in PHP?

The installation of MySQLi affects the functionality of both procedural and object-oriented interfaces in PHP by providing an improved and more secure way to interact with MySQL databases. MySQLi offers prepared statements, transactions, and improved error handling compared to the older MySQL extension. To take advantage of these features, developers need to update their code to use MySQLi functions instead of the deprecated MySQL functions.

// Procedural MySQLi interface example
$connection = mysqli_connect("localhost", "username", "password", "database");

if (!$connection) {
    die("Connection failed: " . mysqli_connect_error());
}

// Object-oriented MySQLi interface example
$mysqli = new mysqli("localhost", "username", "password", "database");

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