This document discusses the PHP library Inspekt, which aims to make PHP web application development more secure. It does this by restricting direct access to superglobal variables like $_GET and $_POST, forcing developers to explicitly retrieve data from these sources. This prevents accidental exposure of unfiltered data. Inspekt provides features like wrapping superglobals in "cages" to enforce data filtering, centralized handling of filtering, and tools to customize and extend its filtering capabilities. The goal is to make secure coding practices easier while making insecure code harder to produce.