Saving multiple selections from drop down list to database

This post will teach you how to process and store multiple selections from a form element into a MySQL database, using PHP. In order to understand how it works, you will need basic knowledge of PHP arrays, because they’re necessary for achieving the results.

If you still don’t know what arrays are and how do they work, read Tizag’s array tutorial first.

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Submit forms with POST method using AJAX

AJAX (Asynchronous JavaScript And XML) is a keystone of Web 2.0 and is very useful in many aspects, because it offers the possibility to change the structure of the page (DOM). For instance, it makes possible sending a form in a website without having to reload the whole page (’asynchronously‘ is the magic word here). The data submitted is processed and may be saved in a database just like classic forms do, but the user can continue browsing during the process.

AJAX forms are a must-have for any AJAXed website. They can be used for many, many purposes: for checking whether a username already exists in the database; for seamlessly sending registrations, feedback or comments; or even for creating a shoutbox or chat script.
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