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This chapter contains this tip: "One thing most beginner developers don’t realize is that it’s possible—in fact, quite easy—for a hacker to submit data to your PHP script without using your intended HTML form. For this reason, it’s important that you validate the existence of expected variables (i.e., that
they are set), their type, and their values."


I take it that the example presented in Script 6.7 demonstrated how to validate the fields? So that there would be no need to use the function isset in this particular case for example?


Than you.

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Good question! No, I would actually use isset() on all the POST variables before using empty() or doing other checks. Just a bit safer that way (well, it avoids errors). 

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