Validating checkboxes with php

Only the submitted form field names and values exist for the script.

I was setting up an HTML form today and I wanted to group some options together in a multi checkbox set, allowing a user to select multiple options in a category.

There are two main methods for validating forms: (usually done using Java Script).

Server-side validation is more secure but often more tricky to code, whereas client-side (Java Script) validation is easier to do and quicker too (the browser doesn't have to connect to the server to validate the form, so the user finds out instantly if they've missed out that required field! In this tutorial we'll build a simple form with client-side Java Script validation.

As I was looking up the syntax for an HTML checkbox, I found a lot of info that said I could simply name all of the checkboxes the same and it would group all of the values together like this: But this doesn’t work.

method provides an simple and reliable way to track down the status of checkboxes.

It works well in all condition because every checkbox has checked property which specifies its checked or unchecked status.

Shows you how to write a script that ensures your form is filled in correctly before it's sent to your server.

Great for "required fields" such as email addresses!

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