Is your CodeIgniter 3 project throwing PHP compatibility warnings or slowing down because of
outdated code? You’re not alone. Many businesses still run on CI3, but with PHP evolving rapidly, staying on CI3 is becoming a liability.
At Websicon Infoworld, we specialize in converting CodeIgniter 3 (CI3) projects to CodeIgniter 4 (CI4) with a smooth, reliable, and like-for-like migration — ensuring nothing breaks, and your app is ready for PHP 8.2+ and beyond.
Why You Should Upgrade from CI3 to CI4
While CodeIgniter 3 was patched to work with PHP 8.0 and 8.1, newer PHP versions (8.2 and beyond) introduce changes that break compatibility in several areas of the framework.
Since CI3 is no longer officially maintained, no future updates or security patches will be released. This means:
- You risk running into deprecated function errors and compatibility issues.
- Hosting providers are dropping support for older PHP versions — leading to potential site downtime.
- Security vulnerabilities will no longer be patched, exposing your system.
Migrating to CodeIgniter 4 ensures:
- Long-term compatibility with the latest PHP versions.
- Modern codebase with namespaces, better performance, and cleaner structure.
- Stronger security and ongoing updates from the CodeIgniter community.
- Easier maintenance and scalability for your app.
Our CI3 to CI4 Migration Process
We don’t just copy files — we handle the migration with precision to keep your app stable and production ready:
1. Project Audit & Planning
We review your existing CI3 project, identify controllers, models, libraries, helpers, routes, and database
structure. This helps us estimate effort and plan a smooth migration.
2. Environment Setup
We configure a staging environment with CI4 installed so we can migrate, test, and debug without affecting
your live site.
3. Controller & Model Migration
We rewrite or adjust controllers and models to use CI4 namespaces and updated syntax while keeping logic
intact.
4. Routing & Config Migration
CI4 uses a different routing and config system. We ensure all routes, config files, and hooks are ported
properly.
5. View & Helper Updates
Views are updated for compatibility, and custom helpers are rewritten as needed for CI4 standards.
6. Testing & QA
We perform functional testing of every feature — both frontend and backend — to ensure feature parity.
7. Performance Optimization
CI4 is faster by design, but we also optimize database queries, caching, and asset loading for maximum
speed.
8. Deployment & Post-Migration Support
We deploy the updated CI4 site to your live server, monitor for issues, and offer a bug-fix window for peace
of mind.
Key Benefits of CI4 Migration
- Faster Performance – Better architecture means quicker page loads.
- Improved Security – Regular updates protect your application from vulnerabilities.
- Modern Codebase – Namespaces, improved routing, and composer support make development easier.
- Future-Proofing – Stay compatible with PHP updates and avoid forced rewrites later.
- Better Scalability – CI4 is designed for larger applications and enterprise use.
Why Choose Websicon Infoworld
- 10+ Years of Experience with PHP frameworks and enterprise web solutions.
- Zero-Downtime Migration approach — your users stay unaffected.
- Complete Feature Parity – We ensure nothing is lost or broken.
- Post-Migration Support – We stand by our work with a support window.
Ideal For:
- Businesses still running mission-critical systems on CI3.
- Agencies managing client projects with PHP version issues.
- Startups looking to scale without tech debt.
Get Started Today
Future-proof your web application and avoid PHP version headaches. Our CI3 to CI4 migration service is designed to be smooth, reliable, and fast — so you can focus on running your business, not fixing errors.
Contact us today to discuss your project and get a detailed migration plan with a clear timeline and cost estimate.
Frequently Asked Questions
Why should I migrate from CodeIgniter 3 to CodeIgniter 4?
CI3 is no longer officially maintained and will not receive updates or security patches. Migrating to CI4 ensures compatibility with PHP 8.2+, better performance, stronger security, and a modern codebase built for scalability.
Will my application break during the migration?
No. We follow a structured migration process that includes staging, testing, and QA to ensure feature parity. Your live application remains unaffected until the upgraded version is fully tested and ready to deploy.
How long does a typical CI3 to CI4 migration take?
The timeline depends on your project’s size and complexity. Small-to-medium apps may take 2–4 weeks, while larger, enterprise-level applications could take longer. We provide a clear timeline after auditing your project.
Do you provide post-migration support?
Yes. We offer a support window after deployment to address any bugs, performance issues, or adjustments needed. Our goal is to ensure a seamless transition with zero downtime.
Will my existing features and database remain the same?
Yes. We ensure complete feature parity — meaning your existing features, workflows, and database structure remain intact. We only modernize the codebase to align with CI4 standards.
What if my project has custom libraries or third-party integrations?
We handle those too. Custom libraries and third-party integrations are carefully reviewed, updated, or rewritten for CI4 compatibility, ensuring your application continues to work smoothly without loss of functionality.
