How can including external classes in PHP code prevent the "Class 'CarFactory' not found" error?

When including external classes in PHP code, you need to use the `require` or `include` statement to load the external PHP file that contains the class definition. This ensures that the class is available for use in your code and prevents the "Class 'CarFactory' not found" error from occurring. 

// Include the external PHP file containing the CarFactory class definition
require 'CarFactory.php';

// Now you can create an instance of the CarFactory class
$carFactory = new CarFactory();

Keywords

PHP include external classes autoloading namespace

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