Validating user input in php
There are a lot of places a user can change your data, so the best way to look at it is so: if you’re using a piece of data that you did not create and are not in control of every step of the way, you need to validate it.As a side note, filtering, validating, and escaping data are technically speaking three different things, but for simplicity sake, when I refer to validatation, I’m really refering to some or all of those aspects.Also - do I need to do anything to the querystrings (with the user input) before putting them in links? Should I add another query to retrieve possible values, loop through the results and exclude those user inputs that aren't found?
After you’ve asked yourself those questions and thought about your data, you’ll have a good idea on where to start, but just knowing the concept won’t help you with implementation, so let’s take a closer look at each of these.
Validation can be defined by many different methods, and deployed in many different ways.
Server side validation is performed by a web server, after input has been sent to the server.
Let’s take a look at how you might receive user controllable data: This is a pretty tricky subject, because if you’re too specific, you might miss a scenario where perfectly valid data is rejected, but if you’re too unrestrictive, you’ll get data that’s not useful.
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Some of the things you can control are the length of characters — you should always set a limit — ranges e.g.
PHP form input validation is what separates amateur and professional PHP developers.
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