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My website, [login to view URL], is running CodeIgniter 3.1.13 on PHP 7. I need it migrated to CodeIgniter 4.7.2 and PHP 8.5 without breaking anything visible to my users or my team. Key points • The user authentication system and the admin panel must behave exactly as they do today—same URLs, same roles, same permissions. • I already hold a full file and database backup, so you will have safe ground to work on a staging copy first. • I am not sure whether any hidden custom plugins or helper classes were added over the years, so an initial audit of the code base is essential before the actual upgrade begins. Your tasks 1. Review the current CodeIgniter 3 project, flag any legacy or incompatible libraries, and propose solutions. 2. Set up a staging environment on PHP 8.5, install CodeIgniter 4.7.2 via Composer, and port all existing functionality. 3. Re-implement or refactor models, controllers, routes, and views where CI4 architecture requires it. 4. Migrate configuration, session handling, and CSRF settings, making sure login, registration, password reset, and the entire admin dashboard work flawlessly. 5. Run unit and functional tests, fix issues that surface, then coordinate the live switch-over with minimal downtime. Deliverables • Fully upgraded project source on CI 4.7.2, ready to deploy on PHP 8.5. • A short migration report describing every change, including any packages you replaced or removed. • Step-by-step deployment guide so I can reproduce the setup if I ever move servers. Acceptance criteria [login to view URL] loads under PHP 8.5 with no fatal errors, all admin features and user logins operate normally, and Lighthouse/DevTools show no deprecated warnings tied to CI3 code. If you have deep CodeIgniter experience and can work methodically with backups and staging, let’s talk timelines.
Project ID: 40421523
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193 freelancers are bidding on average $452 USD for this job

⭐️⭐️⭐️ Seamless CodeIgniter 3 to CodeIgniter 4 Migration on PHP 8.5⭐️⭐️⭐️ I will begin with a full audit of your existing CodeIgniter 3.1.13 codebase to identify legacy dependencies, custom helpers, and compatibility risks. Set up a secure staging environment on PHP 8.5 and rebuild the application using CodeIgniter 4.7.2 while preserving all existing URLs, authentication flows, roles, and admin functionality. Refactor controllers, models, routes, and configurations to align with CI4 architecture without impacting user experience. Thoroughly test all modules including login, registration, sessions, CSRF, and admin panel to ensure zero functional regression. Let’s chat… Thanks
$540 USD in 13 days
9.6
9.6

With a deep pool of expertise and more than a decade's presence in the industry, ZAWN Tech confidently stands out in this sector as an IT and Engineering company you can trust. As an integral part of our scope of services, we have successfully undertaken numerous projects that involved CodeIgniter migration without compromising on any of the existing features, and we are confident we can bring the same value to your website, freenez.com. My team is highly experienced in CodeIgniter upgrades-- specifically with migrating from CodeIgniter 3 to 4 while ensuring smooth functioning of all underlying features. We will meticulously review your project, identifying any legacy or incompatible libraries and providing comprehensive recommendations on how best to address each issue. Setting up a staging environment using PHP 8.5, installing CI 4.7.2 via Composer and effectively porting all existing functionalities would be expertly handled by us. Our work doesn't stop there though! We will also take particular care in re-implementing or refactoring any models, controllers, routes, and views where the CI4 architecture requires it. We prioritize optimizing your site's performance by ensuring perfect migration of configuration, session handling, CSRF settings whilst preserving the normal functioning login, registration, password reset, and every aspect of the admin dashboard.
$750 USD in 7 days
8.8
8.8

Hello, I have extensive experience in CodeIgniter development and have successfully completed similar projects. I can seamlessly upgrade your website from CodeIgniter 3.1.13 to 4.7.2 on PHP 8.5 without disrupting user experience or functionality. I will meticulously review your current project, identify any legacy components, and propose effective solutions. Setting up a staging environment, installing CI 4.7.2, and ensuring all existing features are ported over smoothly are among my priorities. Additionally, I will refactor components where necessary to align with CI4 architecture. My deliverables will include a fully upgraded project source, a detailed migration report, and a comprehensive deployment guide for your convenience. Let's discuss further to align on timelines and get started on this seamless upgrade process. Looking forward to collaborating with you on this project. Best regards, | CodeIgniter Expert
$350 USD in 3 days
8.4
8.4

Hi, I’m a CodeIgniter expert with strong experience upgrading CI3 apps to CI4 on PHP 8+. I’ll audit your codebase, identify incompatible libraries, and migrate everything to CI 4.7.2 with clean architecture while preserving auth, admin panel, routes, and behavior. I’ll set up staging, test thoroughly, and ensure smooth deployment with minimal downtime. I can start immediately and deliver a stable upgrade fast.
$500 USD in 7 days
8.3
8.3

Upgrading a CodeIgniter 3 application to version 4.7.2 is a precise task that requires a careful approach to handle namespace changes, library updates, and core structural differences. I have handled numerous framework migrations and legacy system upgrades, ensuring that the codebase remains stable while moving to the latest environment. With over 15 years of experience in PHP, MySQL, and full-stack development, I am well-versed in the architectural shifts between CodeIgniter versions. My background in troubleshooting and deep-diving into server-side code allows me to identify and resolve compatibility issues quickly, ensuring your application functions correctly after the transition. I can complete this upgrade for $432.92 within a 1-day timeframe, minimizing downtime for your project. Please send me a message so we can discuss your specific implementation and get started.
$432.92 USD in 1 day
8.1
8.1

Hi there, I can handle your full migration from CodeIgniter 3.1.13 (PHP 7) to CodeIgniter 4.7.2 on PHP 8.5 with a structured, zero-risk approach using staging first. I’ll begin with a detailed audit of your existing codebase to identify legacy libraries, custom helpers, and compatibility issues, then map out a clean migration plan that preserves your current URLs, authentication flow, roles, and admin behavior exactly as they are. I’ll rebuild the application in CI4 architecture (controllers, models, routes, configs), migrate sessions and security settings, and thoroughly test all user and admin flows before coordinating a smooth live switch with minimal downtime. You’ll receive clean upgraded code, a full migration report, and a step-by-step deployment guide. Kindly send me a message to discuss timelines and access. Thanks
$400 USD in 8 days
8.2
8.2

Hi, I’ve worked extensively with both CodeIgniter 3 and 4, leading multiple CI4 projects from scratch. I understand the intricacies of migrating from CI3 to CI4, especially with custom plugins and libraries that may not be directly compatible. For your project, I’d start with a thorough code audit to identify any legacy code that needs attention. I’d also ensure that all existing features, including user roles and permissions, work seamlessly after the upgrade. With CI4, I’ve developed several production-ready applications, so I’m well-versed in adapting CI3 code to fit the new framework’s structure. Let’s schedule a quick 10-minute call to discuss your project in more detail and see if I’m the right fit. I usually respond within 10 minutes. I’m eager to learn more about your exciting project. Best regards, Adil
$275 USD in 7 days
7.5
7.5

Hi, We’re Doomshell, experienced in CodeIgniter migrations and PHP upgrades with a focus on zero-break transitions. Our Approach Phase 1: Audit (2–3 days) • Review CI3 codebase, custom helpers, libraries • Identify CI4/PHP 8.5 incompatibilities • Share migration plan with risk points Phase 2: Migration (5–8 days) • Set up staging (PHP 8.5 + CI 4.7.2 via Composer) • Refactor controllers, models, routes, views to CI4 structure • Migrate configs (sessions, CSRF, env) • Ensure auth system + admin panel behave exactly the same Phase 3: Testing & Deployment (2–3 days) • Functional + edge-case testing (login, roles, dashboard) • Fix issues, optimize performance • Coordinate smooth live deployment with minimal downtime Deliverables • Fully upgraded CI4 project (PHP 8.5 ready) • Migration report (changes, replaced packages) • Step-by-step deployment guide Expertise • CodeIgniter 3 → 4 migrations • Legacy system refactoring • Secure auth & session handling Questions Any third-party integrations (APIs, payments)? Size of database & number of modules? Preferred staging setup (subdomain/local)? We ensure no visible changes for users, just a faster, future-ready system
$730 USD in 5 days
7.6
7.6

Hello, Migrating from CodeIgniter 3 to CodeIgniter 4 requires a careful, methodical approach, and I can handle the full upgrade while preserving your existing authentication flow, admin panel behavior, URLs, roles, and permissions exactly as they work today. I will begin with a complete code audit to identify legacy libraries, custom helpers, and compatibility risks, then rebuild and refactor the application on a staging environment running PHP 8.5 and CI 4.7.2 with minimal disruption. My focus will be on clean migration of controllers, models, routes, sessions, CSRF handling, and all core functionality, followed by thorough testing to ensure the live switch happens smoothly and safely. With strong PHP and deep CodeIgniter migration experience, I can deliver a stable upgraded codebase, detailed migration report, and clear deployment guide for long term maintainability. Here is my portfolio: https://www.freelancer.in/u/sainiji92 I would be happy to connect in chat or a quick meeting to review your codebase and plan a seamless upgrade path professionally. Regards, Pankaj
$300 USD in 7 days
6.9
6.9

Hi, I will seamlessly upgrade your CodeIgniter 3.1.13 website on PHP 7 to CodeIgniter 4.7.2 on PHP 8.5 without any visible disruptions for your users or team. You can expect a smooth transition with the user authentication system and admin panel functioning identically. I will conduct a thorough audit of the codebase, set up a secure staging environment, and meticulously migrate all existing functionalities. Rest assured, I will handle the migration process with precision and care to ensure a flawless outcome. Can you provide insights into any potential custom plugins or helper classes that might impact the upgrade process? Let's chat further so I can give you a proper timeline and get things moving.
$250 USD in 2 days
6.6
6.6

As an experienced full-stack developer with over 12 years of expertise, I specialize in many areas that enable me to execute your project seamlessly. My savvy skill set in MySQL, PHP, and Web Development aligns perfectly with your CodeIgniter upgrade requirements. Over the years, I have handled several similar projects including meticulous migrations, full code audits, thorough testing and seamless live deployments. One distinct value I bring to the table is my ability to provide complete software solutions - be it web, mobile, backend systems or APIs. This means that not only can I meticulously manage the CI 3-to-4 upgrade, but ensure it works seamlessly across all platforms. Additionally, my deep familiarity with MySQL ensures smooth database management which is crucial for your project. A key differentiator which I believe makes me extremely well-suited for this project is my approach of end-to-end handling. From frontend to backend development along with CMS integration and management of databases; I can do it all. With me managing your CodeIgniter migration, you can expect a completely upgraded project on CI 4.7.2 ready to deploy on PHP 8.5 that guarantees absolutely no fatal errors and flawless operations as per your acceptance criteria. Let's connect now and get started right away!
$250 USD in 7 days
7.1
7.1

Hi I can handle a smooth and safe migration of your CodeIgniter 3 application to CodeIgniter 4 on PHP 8.5 while preserving all existing functionality and user experience. I will begin with a full audit of your current codebase to identify legacy components, custom helpers, and potential incompatibilities, then plan a structured migration approach. Using a staging environment, I will rebuild controllers, models, routes, and configurations to align with CI4 architecture while ensuring authentication, sessions, and admin workflows behave exactly as they do الآن. Every feature will be tested thoroughly to prevent regressions and maintain stability. I focus on clean, maintainable upgrades with zero disruption, and I will provide a clear migration report along with deployment steps for future scalability. Best, Justin
$500 USD in 7 days
6.2
6.2

Hello Dear! Greetings from Toriqul Global Solutions! We are a reliable and experienced web design & development company led by Engineer Toriqul Islam (B.Sc. in CSE, RUET), with over 10 years of proven industry experience delivering quality digital solutions. At Toriqul Global Solutions, we build modern, user-friendly, high-performance websites focused on simplicity, elegance, and functionality to boost engagement and business growth. Technologies We Use: Custom Websites Development Using ======>Full Stack Development. 1. HTML5 2. CSS3 3. Bootstrap 4. jQuery 5. JavaScript 6. AngularJS 7. React JS 8. Node.js 9. WordPress 10. PHP 11. Ruby on Rails 12. MYSQL 13. Laravel 14. .NET 15. CodeIgniter 16. React Native 17. SQL / MySQL 18. Mobile app development 19. Python 20. MongoDB and more skills What will you get? • Responsive design on All Devices •Reusable components •Clean code •Timely delivery tested •Clear communication We would be honored to discuss your project requirements and help bring your ideas to life. Thank you for your time and consideration. Warm Regards, Toriqul Global Solutions
$250 USD in 7 days
6.1
6.1

Hi There!!! ★★★★ ( CodeIgniter 3 to 4.7.2 full migration with zero downtime & safe staging upgrade ) ★★★★ Project understanding: I understand you need a complete upgrade of your existing CodeIgniter 3.1.13 system to CodeIgniter 4.7.2 on PHP 8.5 without breaking current login, admin panel or user flows. The migration must be done carefully with staging, full audit and zero disruption to live users. ⚜ Full CI3 codebase audit & compatibility check ⚜ Staging setup on PHP 8.5 with CI4.7.2 via Composer ⚜ Migration of controllers, models, routes & views ⚜ Auth system & admin panel behavior preservation ⚜ Session, CSRF & config migration to CI4 standards ⚜ Testing (unit + functional) & bug fixing ⚜ Deployment guide + migration report documentation I am Farhin B, PHP developer with strong experience in CodeIgniter migrations and legacy system upgrades. I have worked on maintaining old CI3 systems and safely moving them to modern CI4 architecture. I will first analyse your full codebase, identify hidden dependencies, then carefully refactor step by step ensuring same behaviour in new version without breaking existing features. Let’s connect and discuss staging access, I can start with audit and migration plan immediately. Warm Regards, Farhin B.
$256 USD in 10 days
6.6
6.6

Upgrading from CodeIgniter 3 to 4 while moving to PHP 8.5 is a careful process, especially with auth and admin features that must stay identical for users and your team. Starting with a full code audit to spot legacy libraries and unknown plugins will help avoid surprises during the port. Setting up a PHP 8.5 staging environment and installing CI 4.7.2 via Composer lets us isolate the migration safely. I’ll refactor models, controllers, routes, and views to align with CI4’s structure, paying particular attention to preserving your user roles, permissions, and URLs exactly as they are. Migrating session handling and CSRF will be tested thoroughly around login, registration, and admin workflows to prevent any breaks. For testing, I usually combine basic unit tests with exploratory manual checks to catch edge cases CI’s builtin tools might miss. One question: Are you currently using any third-party plugins or overly customized helpers that you know of? Knowing this early can shape the audit scope and timing. Once stable on staging, I’ll prepare a clear migration report and deployment instructions so you or another dev can replicate the setup without hassle. I’m ready to jump in and schedule the work to minimize downtime when we switch live.
$500 USD in 7 days
5.9
5.9

Hi, I have gone through your project description and understand you’re looking to upgrade a CodeIgniter 3.1.13 project to CodeIgniter 4.7.2 with PHP 8.5 while keeping all current functionality intact, especially authentication and admin flows. I have strong experience working with CodeIgniter migrations and PHP upgrades, including refactoring legacy CI3 structures into CI4 architecture, handling routing changes, session updates, and fixing compatibility issues with newer PHP versions. For your project, I would first audit the existing codebase to identify deprecated or custom components, then set up a CI4 staging environment and carefully migrate models, controllers, and views while preserving your current user/admin behavior. I will ensure login, permissions, and all core features work exactly as they do now before coordinating the final deployment. Best regards, Juan
$350 USD in 7 days
5.9
5.9

Hello, I came across your CodeIgniter 3-to-4.7.2 Upgrade -- 2 and I am very interested in working with you. I have reviewed your requirements and full understand the scope of expectations. I specialize in PHP, Codeigniter, MySQL, HTML, Web Development, Database Management, API Integration, Web Application, and have successfully delivered similar projects before. I am committed to delivering high-quality work with reliability, clarity and professionalism. I work transparently throughout the project progress, deadlines and expectation stay clear at every stage. I would be glad to disucss further details and am ready to start immediately. Looking forward to hearing from you. Regards. Anum
$250 USD in 4 days
5.6
5.6

Hello, hope you are doing well. I can migrate your CodeIgniter 3.1.13 project to CodeIgniter 4.7.2 on PHP 8.5 safely by first auditing your current codebase, then rebuilding and refactoring the structure in a staging environment. I will ensure all existing features—especially login, roles, permissions, and admin panel—work exactly the same with no visible changes to users. I’ll handle the full migration (models, controllers, routes, configs, sessions), test everything carefully, and provide a clean deployment with a short migration report and step-by-step guide. Regards, Webzone Network
$300 USD in 2 days
5.5
5.5

hi, i have reviewed the details of your project. i can handle this migration carefully by first auditing your full codebase to identify legacy code, custom helpers and hidden dependencies. then i will set up a staging environment, install ci4 with composer and gradually port controllers, models, routes and views. i will also make sure login, admin panel, sessions and security features work without breaking anything. i have strong experience in php and codeigniter upgrades and i always work in staging first to avoid production risk. can we schedule a quick meeting to discuss the project in detail. it will help me understand your needs better and give you a clear plan with timeline and budget. i will also share my portfolio during the chat. mughira
$500 USD in 7 days
5.4
5.4

Hello! I am interested in your project and confident I can deliver excellent results. Let's discuss your requirements so I can start immediately.
$250 USD in 7 days
5.1
5.1

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