An login formular into the admin-area for your homepage.
The scripts of the php-Basics series require rudimentary knowledge in dealing with variables and program sequences.
They serve the purpose of doing something with your newly acquired basic knowledge of PHP.
It should only be application examples for inspiration, which can be expanded further.
Most of the explanations for the individual steps can be found in the source code.
Homepage:
http://www.numaek.de/Tutorial-30-Administrationsbereich.html