Web Reference: All the other libraries, which exist in both CodeIgniter versions, can be upgraded with some adjustments. The most important and mostly used libraries received an Upgrade Guide, which will help you with simple steps and examples to adjust your code. Please read the upgrade notes corresponding to the version you are upgrading from. See also Backward Compatibility Notes. If you don’t know what version of CodeIgniter you are currently running, you can get it from the Debug Toolbar, or simply echo the constant \CodeIgniter\CodeIgniter::CI_VERSION. Dec 13, 2023 · This article is a detailed roadmap for developers upgrading from CodeIgniter 3 to CodeIgniter 4. It focuses on fundamental changes, stressing the need to check if the server meets the new PHP requirements first.
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