Installation

CodeIgniter4 can be installed in a number of different ways: manually,using Composer, or usingGit.Which is right for you?

• If you would like the simple “download & go” install that CodeIgniter3is known for, choose the manual installation.
• If you plan to add third party packages to your project, werecommend the Composer installation.
• If you are thinking of contributing to the framework,then the Git installation is right for you.

• Manual Installation
• Composer Installation
• Git Installation
• Running Your App
• Upgrading From a Previous Version
  • Upgrading from 3.x to 4.x
• Troubleshooting
• CodeIgniter Repositories

However you choose to install and run CodeIgniter4, theuser guide is accessible online.

Note

Before using CodeIgniter 4, make sure that your server meets therequirements, in particular the PHPversion and the PHP extensions that are needed.You may find that you have to uncomment the php.ini “extension”lines to enable “curl” and “intl”, for instance.