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Syntactic validation should enforce correct syntax of structured fields (e.g.SSN, date, currency symbol) while semantic validation should enforce correctness of their values in the specific business context (e.g.Above is an example of how we can easily change both HTML and CSS on the page (a relatively harmless example).To combat this, we can use htmlspecialchars(), htmlentities() or strip_tags(); htmlspecialchars() takes a string and as optional parameters – ‘flags’, the ‘encoding’ to be used when converting the characters and a ‘double encoding’ option which is set to true by default and when turned off forces PHP not to encode existing HTML entities.Your Outlook add-in can send you an identity token, but before you trust the request you must validate the token to ensure that it came from the Exchange server that you expect.The example in this article uses PHP to validate the identity token; however, you can use any programming language to do the validation.Plus, learn how to email form data and save it in a My SQL database so that it's ready for other applications.Email addresses: easy to create, difficult to type. Note that FILTER_VALIDATE_EMAIL will validate email addresses that contain domains and top-level domains that do not exist.

We are also going to examine PHP 5’s built-in input validation and filtering methods (focusing mostly on filter_var).Sadly, most beginning programmers fail to understand the truth about security: there is no such thing as "secure" or "insecure." The wise programmer knows that the real question is a site is.Once any piece of data is stored in a database, in a text file, or on a Post-it note in your office, its security is compromised.Input Validation should not be used as the primary method of preventing XSS, SQL Injection and other attacks which are covered in respective cheat sheets but can significantly contribute to reducing their impact if implemented properly.Input validation should be applied on both syntactical and semantic level.You can see that the $query variable is passed to the anchor and to the text which contains the escaped with htmlspecialchars() input.

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