Book Image

CodeIgniter 1.7 Professional Development

By : Adam Griffiths
Book Image

CodeIgniter 1.7 Professional Development

By: Adam Griffiths

Overview of this book

<p>CodeIgniter is an open source PHP framework with a small footprint and exceptional performance. It gives you a rich set of libraries for common tasks, with a simple interface to access them. There are several unexplored aspects of CodeIgniter that can help developers build applications more easily and quickly. In this book, you will learn the intricacies of the framework and explore some of its hidden gems.<br /><br />If you want to get the most out of CodeIgniter, this book is for you. It teaches you what you need to know to use CodeIgniter on a daily basis. You will create mini-applications that teach a specific technique and let you build on top of the base. <br /><br />This book will take you through developing applications with CodeIgniter. You will learn how to make your CodeIgniter application more secure than a default installation, how to build large-scale applications and web services, how to release code to the community, and much more. You will be able to authenticate users, validate forms, and also build libraries to complete different tasks and functions.<br /><br />The book starts off introducing the framework and how to install it on your web server or a local machine. You are introduced to the Model-View-Controller design pattern and how it will affect your development. Some important parts of the CodeIgniter Style Guide are included to keep CodeIgniter development as standardized as possible; this helps greatly when working as part of a team or taking on an old CodeIgniter project. You will quickly move on to how CodeIgniter URLs work and learn about CodeIgniter-specific files such as helpers and plugins. By the time you finish this book, you will be able to create a CodeIgniter application of any size with confidence, ease, and speed.</p>
Table of Contents (16 chapters)
CodeIgniter 1.7 Professional Development
Credits
About the Author
About the Reviewers
Preface
Index

Image Manipulation Library


Now that we've built ourselves a simple image uploader, we can take a look at the Image Manipulation Library. This class let's you create thumbnails, crop and resize images, rotate images, and even watermark images.

Note

Watermarking images is only available using the GD or GD2 library. Although other libraries are supported, the GD library needs to be used for this process.

In order for most of the functions provided by this class to work, the image folder will need write permissions. In our case we have changed the permissions of the uploads folder to 777; this gives it read, write, and execute permissions, so we don't need to change anything else.

Initializing the library

Before using the Image Manipulation Library we need to set a few configuration values. We need to specify the image processing library to use (from GD, GD2, ImageMagick and NetPBM), the image that we are going to perform an action on, and a few more configuration values. We might also need to...