Security
Database security with respect to PHP comes down to two broad issues:
Protecting the database access information
Being cautious when inserting data in the database
You can accomplish the first objective by securing the MySQL connection script outside of the Web directory so it is never viewable through a Web browser. I discussed this idea earlier in the chapter and will discuss it more in Chapter 8.
For the second objective, there are numerous options. First, as I’ve been doing in this chapter, is to use the $_POST array (or $HTTP_GET_VARS, $HTTP_POST_VARS, or $_GET) instead of global variables. Second is to use regular expressions to make sure that submitted data matches what you would expect it to be. Regular expressions will also ...
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