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Step 1: Update your CodeIgniter files Replace the following directories in your "system" folder with the new versions: Note: If you have any custom developed CodeIgniter User Guide. Note: The instructions on this page assume you are running version 1.5.0 or 1.5.1. Step 1: Update your CodeIgniter files. Welcome; Basic Info; Installation; Introduction; Tutorial; Contributing to CodeIgniter; General Topics; Library Reference; Database Reference Step 1: Update your CodeIgniter files Replace the following directories in your "system" folder with the new versions: Note: If you have any custom developed Step 1: Update your CodeIgniter files. Replace these files and directories in your "system" folder with the new versions: application/config/user_agents.php ( Step 1: Update your CodeIgniter files. Replace these files and directories in your "system" folder with the new versions: system/database/drivers; system/ This is a read-only repository used to publish the user guide for the current release. It is built automatically as part of the framework release workflow,Welcome to CodeIgniter. CodeIgniter is an Application Development Framework - a toolkit - for people who build web sites using PHP. Getting Started · Composer Installation · Manual Installation · Running Your App · Troubleshooting · Change Logs · Upgrading From a Previous Version · CodeIgniter