What are the best practices for including and using external classes in PHP?

When including external classes in PHP, it is important to follow best practices to ensure proper functionality and maintainability of your code. This includes using autoloading to automatically include classes when needed, organizing classes into namespaces to prevent naming conflicts, and utilizing composer to manage dependencies efficiently. 

// Autoloading classes using composer
require 'vendor/autoload.php';

use App\MyClass;

$myClass = new MyClass();
$myClass->doSomething();

Keywords

autoloading namespaces composer dependency injection class inheritance

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