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PHP and MySQL by Example by Marko Gargenta, Ellie Quigley

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Appendix DSecurity and Debugging

D.1 About Security

Security is a set of measures applied to a Web application to meet the security requirements of the Web site. A site will never be 100 percent secure—there is always a way in. Just as there is always a thief who can break into bank vault, there is always a hacker who can break into your site.

To be secure, you must define your security requirements and how much you are willing to spend to meet them. In defining the security requirements of your site, there are several issues to consider: The security of your network, the operating system, the file system, the Web server your Web applications are running on, and, finally, the Web application itself and the database it is using. ...

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