What are best practices for including external libraries or classes, such as mailer classes, when deploying a PHP application to a web server?

When deploying a PHP application to a web server, it's important to ensure that any external libraries or classes, such as mailer classes, are included correctly. One best practice is to use Composer to manage dependencies and autoload classes. This helps keep your code organized and makes it easier to include external libraries without cluttering your project with unnecessary files. 

// Include Composer's autoloader to load external libraries
require 'vendor/autoload.php';

// Use the external library or class in your PHP code
use Some\External\MailerClass;

// Instantiate the external class and use it as needed
$mailer = new MailerClass();
$mailer->sendEmail('recipient@example.com', 'Subject', 'Message');

Keywords

composer autoloading namespaces require_once dependency management

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