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PHP 5 Advanced: Visual QuickPro Guide by Larry Ullman

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4. Security Techniques

With more and more personal information being stored on the Web—credit card data, social security numbers, maiden names, favorite pets—today’s PHP developer cannot afford to be ignorant when it comes to security. Sadly, most beginning programmers fail to understand the truth about security: there is no such thing as “secure” or “insecure.” The wise programmer knows that the real question is how secure a site is. Once any piece of data is stored in a database, in a text file, or on a Post-it note in your office, its security is compromised. The focus in this chapter is therefore how to make your applications more secure.

This chapter will begin by rehashing the fundamentals of secure PHP programming. These are the basic ...

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