How can PHP code be outsourced and used in different files without being parsed?

To outsource PHP code and use it in different files without being parsed, you can store the PHP code in a separate file with a .php extension and then use PHP's include or require functions to include the file in your main PHP script. This way, the code will be executed as if it were part of the main script without being parsed separately.

// main_script.php
include 'outsourced_code.php';
// continue with the rest of your main script