A site built as products.php, basket.php and checkout.php carries the same fifteen lines at the top of every file: session start, config include, database connection, a login check.…
An application with a PHP file per page has its bootstrap copied into every one of them — session start, config include, database connection, the auth check somebody…
Four unversioned libraries in application/libraries, two of them edited in place. Moving the application onto Composer and PSR-0 without giving up the framework’s own loader.