The Internet is easily the single most hostile computing environment currently in existence, with hundreds and perhaps even thousands of malicious users, known as crackers, just waiting to exploit your site for their own gain. PHP, as the driving element behind your applications, becomes a natural target for them, which means learning to code defensively is a valuable lesson that every PHP developer should be taught early in their career.
The next chapter discusses the various security concerns involved in running PHP, how to work around them, and how to use data encryption to be pro-active about your security.
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