Easy PHP Validation: Validate and fetch request and other value types.

It provides functions to fetch session, cookie, POST or GET form request values, as well other functions to perform several types of validation.

Currently it can validate a value as an e-mail address, a number, alphanumeric test, a date, state code with two characters, IP address, HTTP URL, check whether a value is defined, check the length of the value, provide a default for empty values, and compare two values.