HTTP Authentication
HTTP authentication, currently available only in the module (as opposed to the CGI) version running with the Apache Web server is a way to protect a file by requiring users to enter a username and password in a pop-up window to gain access. It's similar to a log-in/registration system but easier to establish and more strict.
The benefits of HTTP authentication are:
Very little PHP code required
Entered username and password remembered without needing to use PHP to send cookies or establish sessions
A clean interface that will not interfere with your page design
The downsides are:
Limited usability (PHP 4 module with Apache only, although Apache is the most popular Web server and PHP its most popular module)
Not able to establish ...
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