If you're going to be linking up a series of forms into a complete application, you should plan and structure your code accordingly. We teach not only the programming language involved in writing web applications, but also "good design". In these diagrams, you can see where we're planning the various states that the application will pass through (right hand side) and how the application code will be structured (left hand side)

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Associated topic - Designing PHP-Based Solutions: Best Practice

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