As you learned in previous parts of the series, the filter extension permits you to validate elements of a given array very easily as well. Therefore, in this fourth chapter I'm going to explain how to check for Boolean values in arrays, as well as how to validate float numbers using another handy filter.

the examples are pretty simple, running a filter_var on the values to check if it's a boolean and to require that the set of values comes in as an array.

As I said before, the filter extension can be used for more than validating integers, since it provides the required functionality to checking other data types. Thus, in the next few lines I'm going to discuss how to use the extension for validating Boolean values.

They give a few lines of example code to show how different values (like "1" versus 1 and "true" versus true) are affected by PHP's dynamic typing.

In this series of articles I'm going to show you how to work with full-text and Boolean searches using MySQL and PHP 5, but the entirety of the code samples that will be developed here can be easily modified to work with a different database server.

They start with the creation of a "common approach" for making the requests and fetching the results (in classes so that any other database could be substituted). With the class structure in place, they move on to the full-text searches, showing how to format database tables by creating them with a fulltext index on which ever fields you want.