Installation

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

• We recommend the Composer installation because it keeps CodeIgniter up to date easily.

• If you would like the simple “download & go” install that CodeIgniter3 is known for, choose the manual installation.

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

Note

Before using CodeIgniter 4, make sure that your server meets the requirements, in particular the PHP version 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.

• Composer Installation
• Manual Installation
• Running Your App
• Change Logs
  • Version 4.2.1
  • Version 4.2.0
  • Version 4.1.9
  • Version 4.1.8
  • Version 4.1.7
  • Version 4.1.6
  • Version 4.1.5
  • Version 4.1.4
  • Version 4.1.3
  • Version 4.1.2
  • Version 4.1.1
  • Version 4.1.0
  • Version 4.0.5
  • Version 4.0.4
  • Version 4.0.3
  • Version 4.0.0
  • Version 4.0.0-rc.4
  • Version 4.0.0-rc.3
  • Version 4.0.0-rc.2
  • Version 4.0.0-rc.1
  • Version 4.0.0-beta.4
  • Version 4.0.0-beta.3
  • Version 4.0.0-beta.2
  • Version 4.0.0-beta.1
  • Version 4.0.0-alpha.5
  • Version 4.0.0-alpha.4
  • Version 4.0.0-alpha.3
  • Version 4.0.0-alpha.2
  • Version 4.0.0-alpha.1
• Upgrading From a Previous Version
  • Upgrading from 4.2.0 to 4.2.1
  • Upgrading from 4.1.9 to 4.2.0
  • Upgrading from 4.1.7 to 4.1.8
  • Upgrading from 4.1.6 to 4.1.7
  • Upgrading from 4.1.5 to 4.1.6
  • 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