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We are also going to examine PHP 5’s built-in input validation and filtering methods (focusing mostly on filter_var).
Sites are hacked daily, and as you build a site using PHP, you need to know how to keep it safe from the bad guys.
For example, he can target particular browsers and send links with malicious GET parameters which would load external Java Script files.
Above is an example of how we can easily change both HTML and CSS on the page (a relatively harmless example).
Note: Listing A and B are available in manageable text form included with the download file.
The Validate class comes with a number of built-in input validation methods, which are described in Table A.