Special Anniversary Black Friday: Get 30% off all training and 10% off all services Get a Quote


Learn how to migrate to the PHP framework Symfony

· Elise Hamimi · 2 minutes to read
White Paper Symfony PHP

SensioLabs and Smile released a joint white paper “PHP framework migration: from legacy to Symfony” explaining how to migrate to modern PHP frameworks like Symfony. Find a selection of the key information in this infographic design by SensioLabs.

The PHP Ecosystem

Designed in 1994, PHP is an open-source programming language that facilitates interactions between databases and servers. PHP is the foundation of many applications and allows you to structure your code.

Used by more than 78.2% of websites, PHP is one of the dominant computer languages. Because of its open-source nature, PHP relies, like Symfony, on a worldwide community ready to contribute. Thanks to this large community, the PHP language has evolved until its last release: version 8 in December 2020.

PHP often comes with frameworks that allow you to structure the code and facilitate the work of developers. Some companies have developed “in-house” frameworks. But using an open-source framework is the most popular option: of course Symfony, but also Laravel, Yii, CodeIgniter, CakePHP, or Zend.

How to Identify Code Obsolescence?

On one hand, many websites run on legacy code passed between developers. Using legacy code poses risks for complex development projects: quick fixes and patches can be useless at times. Moreover, it’s challenging to determine if a modification will solve the problem or exacerbate it.

On the other hand, some PHP frameworks are not maintained over time. The code is no longer updated or adapted to recent developments. This induces security risks for applications based on these frameworks.

Therefore, to recognize framework obsolescence, we have listed in the white paper 10 signs to watch for. The infographic design highlights 3 critical signs to monitor to prevent obsolescence.

Why Migrate Your PHP Code to Symfony?

To overcome the challenge of obsolescence, you can migrate to Symfony. Symfony is an open-source PHP framework, providing modular and adaptable features. In addition, Symfony is maintained over time, offering a stable working environment. You can check the roadmap on the Symfony website to see the maintenance level of your application.

Symfony makes developers’ lives easier and speeds up website development. Symfony is based on a large, very active community of more than 600,000 developers across 120 countries. Free and open source, the Symfony framework achieves more than 9 million downloads per day.

At the same time, Symfony adapts to the challenges of many businesses. When a company migrates to Symfony, it influences many roles, not only developers but also managers, project managers, and system administrators. In the infographic design, we explain the benefits of Symfony for each role within a company.

Symfony is a Safe Choice

Symfony is a safe choice for the future, thanks to its predictable release cycle. A new version of Symfony is released every 6 months, offering improved features. Every 2 years, Symfony launches a new major version with long-lasting support.

Another advantage of Symfony is that updates are continuous. It allows you to manage deprecations gradually and migrate smoothly. Backward compatibility is also a major feature of Symfony and greatly simplifies migrations between minor versions.

Migrate Your PHP Code to Symfony with SensioLabs

To conclude, do you need to change your PHP framework or upgrade your Symfony application? SensioLabs, the creator of Symfony, helps you migrate to the latest versions of the Symfony framework in a Migration Workshop.

You can find our blog post about the white paper “Migrating to Symfony from legacy PHP code” and download the white paper here.

This might also interest you

The SensioLabs team celebrating the 20th anniversary of Symfony with balloons
Jules Daunay

The Story Continues: SensioLabs Celebrates Symfony's 20th Anniversary

Time flies, especially when you're busy shaping the future of development! The SensioLabs team has just reached a milestone with the anniversary of the Symfony framework. We marked the occasion at the office, but the party isn't over yet. The date is already set for an XXL celebration at SymfonyCon Amsterdam 2025, from November 27 to 28.

Read more
PHP 8.5 URI extension
Oskar Stark

PHP 8.5's New URI Extension: A Game-Changer for URL Parsing

PHP 8.5 introduces a powerful new URI extension that modernizes URL handling. With support for both RFC 3986 and WHATWG standards, the new Uri class provides immutable objects, fluent interfaces, and proper validation - addressing all the limitations of the legacy parse_url() function. This guide shows practical before/after examples and explains when to use each standard.

Read more
3 dog heads
Mathieu Santostefano

Bring Your Own HTTP client

Break free from rigid dependencies in your PHP SDKs. Learn how to use PSR-7, PSR-17, and PSR-18 standards along with php-http/discovery to allow users to bring their favorite HTTP client, whether it's Guzzle, Symfony HttpClient, or another. A must-read for PHP and Symfony developers.

Read more
Blue sign on a building with several Now What? letters
Thibaut Chieux

How To Prioritize Messages When Building Asynchronous Applications With Symfony Messenger

Asynchronous processing offers benefits like decoupled processes and faster response times, but managing message priorities can become a challenge. When dealing with tasks ranging from password resets to complex exports, ensuring timely delivery of critical messages is essential. This article explores common asynchronous processing issues and provides solutions using Symfony Messenger, allowing you to optimize your application without extensive refactoring.

Read more
SensioLabs University Courses announcing the new level 3 Master training course now available
Jules Daunay

Master Symfony: Unlock Expert Skills with Our Training

Take your Symfony proficiency from good to great with the new Level 3 training course at SensioLabs! Master complex topics, optimize performance, and become a Symfony expert.

Read more
PHP 8.5
Oskar Stark

What's New in PHP 8.5: A Comprehensive Overview

PHP 8.5 will be released in November 2025 and brings several useful new features and improvements. This version focuses on developer experience enhancements, new utility functions, and better debugging capabilities.

Read more
Two images: on the left many cars stuck in a traffic jam with the sign "All directions" above, on the right a blue car moving forward alone on the highway with the sign "Service Subscriber" and a Symfony logo above
Steven Renaux

Symfony Lazy Services with Style: Boost DX using Service Subscribers

Boost your Symfony app's performance and developer experience! Learn how to use Service Subscribers and traits for lazy service loading to reduce eager instantiation, simplify dependencies, and create modular, maintainable code.

Read more
the surface of the earth seen from the space with city lights forming networks
Imen Ezzine

HTTP Verbs: Your Ultimate Guide

HTTP Verbs Explained: Learn the basics of GET, POST, PUT, DELETE, and more. This article explains how they work, their applications, and their security implications.

Read more
Poster of Guillaume Loulier presentation
Salsabile El-Khatouri

A Symfony Training at SensioLabs: Behind The Scenes

What does Symfony training at SensioLabs look like? Find out in this interview with Guillaume Loulier, a passionate developer and trainer, who tells us all about the official Symfony training courses.

Read more
Photo speaker meetup AI Symfony
Jules Daunay

Symfony and AI: the video is now available

What about Symfony and Artificial Intelligence (AI)? This was the theme of the exclusive event organized by SensioLabs in partnership with Codéin on October 3rd. With the added bonus of feedback from a development project combining Symfony and AI. If you missed the event, check out the video now available for free on our Youtube channel.

Read more
2025 a year of celebrations for PHP with windows about API Platform, PHP, AFUP and Symfony
Jules Daunay

2025: a year of anniversaries for PHP, AFUP, Symfony and API Platform

2025 is going to be a big year for anniversaries. We will be celebrating the 20th anniversary of Symfony, the 30th anniversary of PHP, the 25th anniversary of AFUP and the 10th anniversary of API Platform. For SensioLabs, this is a major milestone that proves the longevity of the technologies in our ecosystem. We are proud to celebrate these anniversaries with the community all year long.

Read more
SymfonyDay Chicago 2025
Simon André

SymfonyDay Chicago 2025: A Celebration of Community

On March 17th, the Symfony community met in Chicago for SymfonyDay Chicago 2025. The event, held on St. Patrick's Day, was both a celebration of Symfony and a moment to support Ryan Weaver in his fight against cancer. It was more than just a conference — it was a gathering around a valued member of the community.

Read more
Blue ElePHPant on a computer
Imen Ezzine

Optimize Your PHP Code: 8 Functions You Need for Efficient Table Handling

If you want to become a good PHP developer, you must learn to work with arrays. Arrays are used a lot in PHP: temporarily store, organize, and process data before it's saved in a database. Knowing how to work with them efficiently will help you manage and process data more effectively.

Read more
type-safety-uuid
Oskar Stark

Type-Safe Identifiers with Symfony and Doctrine: Using Dedicated ID Classes

Learn how to enhance type safety in Symfony and Doctrine by using dedicated ID classes like BookId and UserId instead of raw UUIDs. This approach prevents identifier mix-ups, improves code clarity, and ensures better integration with Symfony Messenger and repository methods. Explore practical examples and best practices for implementing type-safe identifiers in your Symfony applications.

Read more
SemVer vs. CalVer
Silas Joisten

SemVer vs. CalVer: Which Versioning Strategy is Right for You?

SemVer ensures stability for libraries, while CalVer aligns projects with release cycles. Learn the key differences and best use cases to optimize your versioning strategy.

Read more
Image