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Because you want only certain users to access the catalog administration page, you need to implement some sort of security mechanism that controls access to the sensitive pages in the site. Implementing security requires dealing with two important concepts: authentication and authorization. Authentication is the process in which users are uniquely identified (most often by supplying a username and password), whereas authorization refers to which resources the authenticated user can access. Users who want to access the catalog administration page should first authenticate themselves. After you know who the user is, you decide whether the user is authorized to access the administration page. In HatShop, you ll use an authentication method called HTTP authentication, which allows you to control the login process through an HTML form. After the client is authenticated, PHP automatically generates a cookie on the client, which is used to authenticate all subsequent requests. If the cookie is not found, the client is shown the login HTML form.

NOTE We can extend this concept further by using macros. For the sake of simplicity, our examples do not do this; however, we could rename our w_socket function to w_socket_func, add parameters for the _ _FILE_ _ and __LINE__ arguments, and use this:

1. A, B, C, E, G. The candidate classes are Member, Item, Librarian, Fine, and Loan. 2. A, C, D. The attributes associated with the Loan class are MemberNumber, ItemNumber, and ReturnDate.

#define w_socket(domain,type,protocol) (w_socket_func((domain),(type),(protocol),_ _FILE_ _,_ _LINE))

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The company doesn t want to invest all of its money in a massive e-commerce site, only to find that people actually prefer mail order after all! Or it might find that, after Phase I, the site does exactly what it wants, and there s no point in expanding it further. Either way, I hope that offering a lower initial cost gives my bid the edge. (It might also mean I can get away with a higher total price.) Because this company is already a mail-order business, it probably already has a merchant account and can process credit cards. Therefore, moving on to Phase III as soon as possible would be best for this company so it can benefit from the preferential cardprocessing rates.

This would result in the actual line of code that called w_socket() being used for the report_error() call, rather than always being the same.

Summary

Another area that can benefit greatly from custom wrapper functions is memory management. Many programmers do not check the return value from function calls like malloc(), nor do they track the amount of memory that is currently in use. While we could go as far as to implement our own garbage collection, our major concern is avoiding error conditions, so we concentrate on doing so with special wrappers. Our main goal is to check the return from all memory allocation attempts. Our secondary goal is to monitor the amount of memory being used to simplify identifying memory leak conditions. The first wrapper we write is to allocate memory. Although we use the twoargument calloc() internally for its ability to zero memory, we require only a single argument indicating the amount of memory needed in bytes. If allocation succeeds, we return a pointer to the memory allocated, and we increment a

In this chapter, we ve seen some of the principles of e-commerce in the real, hostile world where it s important to focus on short-term revenue and keeping risks down. We ve looked at the three basic reasons an e-commerce site can make money: Acquiring more customers Making customers spend more Reducing the costs of fulfilling orders We ve applied those principles to a three-phase plan that provides a deliverable, usable site at each stage and continues to expand throughout the book. At this point, you ve presented your plan to the owners of the hat shop. In the next chapter, you ll put on your programming hat and start to design and build the web site (assuming you get the contract, of course).

global counter of memory in use. If allocation fails, we use the report_error() function we wrote in the last section to tell the user what has happened and exit our process.

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