Codeigniter Application Compatibility Fix for Upgraded Php Environment

We are seeking an experienced PHP developer to resolve compatibility issues with an existing CodeIgniter application. Our web hosting environment has recently undergone a PHP version upgrade, which has caused the application to malfunction. The primary objective is to identify and rectify all code and configuration discrepancies that prevent the older CodeIgniter project from running correctly on the newer PHP version. This will involve reviewing the current codebase, updating any necessary dependencies or deprecated functions, and ensuring the application is fully functional and stable in the upgraded environment. Thorough testing will be required to confirm full compatibility and performance.