Your contribution cannot be approved because it is not as informative as other contributions. See the Utopian Rules. Contributions need to be informative and descriptive in order to help readers and developers understand them.

Suggestions:

• You should give more information about provided code examples. Instead of just pasting code and telling readers what are they for, you should really teach technical aspects about the project you contribute.
• And also outdated information or examples which may cause a vulnerability should not be taught without warnings, like SQL Injection in this case.
• I also think that form validation is a data standardization method rather than a security method. So, I see no point for writing "you will learn how to make secure website
  ".

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