Summary
This chapter brings together a few CI helpers and classes with similar themes. They help you to:
- Write and read files on your system with minimal coding, while CI locks and unlocks the files in the background
- Download files, rather than show them as HTML on the screen—with CI providing the HTTP headers and worrying about MIME types for you
- Upload files to your site, allowing you to specify security constraints such as the size and type of files you allow
- Easily manipulate images, to resize them
- Compress your files before you download them to your users
This is what frameworks are all about. Instead of a lot of tedious coding, they let you get on with building an application that works. They give you a standard and easy interface, and worry about ...
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