component in the system has a unique name with no spaces. The code is split into
two folders, each bearing the component name prefixed by com_. The component
in this book will be called reviews. Therefore, you will have to create two folders
named com_reviews:
Create one in the folder named components for the front end.
Create one in the folder named components within the administrator
folder for the back end.
When the component is loaded from the front end, Joomla! will look for a file
with the component's unique name ending in a .php extension. Within the
components/com_reviews folder, create the reviews.php file. Similarly, running
it in the back end assumes the presence of a file prefaced with admin. followed
by the component name and ending in .php. Add the file admin.reviews.php in
administrator/components/com_reviews. Leave both the files empty for
the moment.