Validation

The Validation class provides a lightweight toolkit for making sure the data entered in form fields verifies against a list of simple rules.

When the user fills in his form and submits the data, the PHP server will take each form and verify that it validates against a set of rules set in play by the developer.

The Validation class currently support basic validation procedures like:
- checking for required fields
- min/max input length
- check to see if the text is an email address
- verify if input is a number

These rules can be combined and applied to one or more of the form's fields, and can be used to prevent situations where forms are submitted either empty or with data filled in the wrong fields.