What best practices should be followed when transferring PHP code from one server to another?

When transferring PHP code from one server to another, it is important to ensure that all dependencies are included, configuration settings are updated, and file paths are adjusted accordingly. Additionally, it is recommended to test the code on the new server to ensure that it functions as expected.

// Example PHP code snippet for transferring code to a new server

// Update database connection settings
$servername = "new_server";
$username = "new_username";
$password = "new_password";
$database = "new_database";

// Adjust file paths
include_once('/path/to/new_file.php');

// Test the code on the new server
if ($connection) {
    echo "Code transferred successfully!";
} else {
    echo "Error transferring code.";
}