Installation

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

• If you would like the simple “download & go” install that CodeIgniter3 is known for, choose the manual installation.
• If you plan to add third party packages to your project, or want to keep CodeIgniter up to date easily, we recommend the Composer installation.

• Composer Installation
• Manual Installation
• Running Your App
• Upgrading From a Previous Version
  • Upgrading from 4.1.4 to 4.1.5
  • Upgrading from 4.1.3 to 4.1.4
  • Upgrading from 4.1.2 to 4.1.3
  • Upgrading from 4.1.1 to 4.1.2
  • Upgrading from 4.0.5 to 4.1.0 or 4.1.1
  • Upgrading from 4.0.4 to 4.0.5
  • Upgrading from 4.0.x to 4.0.4
  • Upgrading from 3.x to 4.x
    • Upgrade Models
    • Upgrade Views
    • Upgrade Controllers
    • Upgrade Configuration
    • Upgrade Database
    • Upgrade Emails
    • Upgrade Encryption
    • Upgrade Working with Uploaded Files
    • Upgrade HTML Tables
    • Upgrade Localization
    • Upgrade Migrations
    • Upgrade Pagination
    • Upgrade HTTP Responses
    • Upgrade Routing
    • Upgrade Security
    • Upgrade Sessions
    • Upgrade Validations
    • Upgrade View Parser
• Troubleshooting
• CodeIgniter Repositories

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