Book Image

CodeIgniter 2 Cookbook

By : Robert Foster
Book Image

CodeIgniter 2 Cookbook

By: Robert Foster

Overview of this book

As a developer, there are going to be times when you'll need a quick and easy solution to a coding problem. CodeIgniter is a powerful open source PHP framework which allows you to build simple yet powerful full-feature web applications. CodeIgniter 2 Cookbook will give you quick access to practical recipes and useful code snippets which you can add directly into your CodeIgniter application to get the job done. It contains over 80 ready-to-use recipes that you can quickly refer to within your CodeIgniter application or project.This book is your complete guide to creating fully functioning PHP web applications, full of easy-to-follow recipes that will aid you in any aspect of developing with CodeIgniter. CodeIgniter 2 Cookbook takes you from the basics of CodeIgniter, through e-commerce features for your applications, and ends by helping you ensure that your environment is secure for your users and SEO friendly to draw in customers. Starting with installation and setup, CodeIgniter 2 Cookbook provides quick solutions to programming problems that you can directly include in your own projects. You will be moving through databases, EU Cookie Law, caching, and everything else in-between with useful, ready-to-go recipes. You will look at image manipulation using the Image Manipulation library, user management (building a simple CRUD interface), switching languages on the fly according to the user preference, caching content to reduce server load, and much more.
Table of Contents (18 chapters)
CodeIgniter 2 Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Counting the number of returned results with num_rows()


It's useful to count the number of results returned—often bugs can arise if a section of the code that expects to have at least one row is passed with zero rows. Without handling the eventuality of a zero result, an application may become unpredictably unstable and may give away hints to a malicious user about the architecture of the app. Ensuring correct handling of zero results is what we're going to focus on here.

How to do it...

  1. We're going to create a block of code for a model and controller. You may already have code in a controller, model, or view that does all or some of the following—obviously, you can skip any step that you do not need. Add or adapt the ensuing code into your controller:

    $this->load->model('Some_model');
    $data['query'] = $this->Some_model->some_model_function();
    $this->load->view('some_view', $data);
  2. Add or adapt the following code into your model:

    function some_model_function() {	
           $query...