transaction query over normal php mysqli query in Mysqli

<?php
// Create a new MySQLi instance
$mysqli = new mysqli("localhost", "username", "password", "database");

// Check for connection errors
if ($mysqli->connect_errno) {
    echo "Failed to connect to MySQL: " . $mysqli->connect_error;
    exit();
}

// Start a transaction
$mysqli->begin_transaction();

// Execute the first query
$query1 = "UPDATE accounts SET balance = balance - 100 WHERE id = 1";
$result1 = $mysqli->query($query1);

// Check for errors
if (!$result1) {
    // Rollback the transaction and exit
    $mysqli->rollback();
    echo "Failed to execute query: " . $mysqli->error;
    exit();
}

// Execute the second query
$query2 = "UPDATE accounts SET balance = balance + 100 WHERE id = 2";
$result2 = $mysqli->query($query2);

// Check for errors
if (!$result2) {
    // Rollback the transaction and exit
    $mysqli->rollback();
    echo "Failed to execute query: " . $mysqli->error;
    exit();
}

// Commit the transaction
$mysqli->commit();

// Free up resources
$mysqli->close();
?>