Sanitizing user input is a critical part of software development. Trusting or neglecting to sanitize user input could lead to unauthorized access to the content of your application, mainly user data, or even the server your application is hosted on.
Full image (from xkcd)
The Phalcon\Filter component provides a set of commonly used filters and data sanitizing helpers. It provides object-oriented wrappers around the PHP filter extension.
Types of Built-in Filters
The following are the built-in