Installing CodeIgniter
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Once your server is set up, go to the CodeIgniter site at (http://www.codeigniter.com/) and download the latest version of the framework. Version 1.7.2, the latest, it is only 2.1 MB when zipped, so it doesn't take much time to download the framework.
Unzip the folder, and install the CodeIgniter files in your website's root folder. If you are using XAMPP Lite, this is usually the htdocs folder within the xampplite folder. For WAMP it is www inside the wamp folder.
The CodeIgniter index.php file should be in the root directory. The root folder is the folder that you would point at if you navigated to the site—in this case, by accessing http://127.0.0.1. If ...
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