Adobe Experience Manager (AEM) has officially ended support for PHP 7.4, requiring organizations running on that version to upgrade to PHP 8.0 or higher. This change affects both on-premises and cloud deployments, and failing to migrate leaves your AEM instance vulnerable to security gaps, missing bug fixes, and potential compatibility problems with new features and integrations. If you’re currently running AEM on PHP 7.4—especially in production environments—you need to plan and execute an upgrade before your support window closes completely.
The migration itself is not optional. PHP 7.4 reached end-of-life in November 2022, and Adobe has aligned its support timeline with this deadline. Any AEM instance still running on PHP 7.4 will face breaking changes as dependencies are updated, third-party extensions stop receiving patches, and core AEM features begin requiring PHP 8+ functionality. For example, if you’re using Composer to manage dependencies, many packages already refuse to install on PHP 7.4, and this restriction will only tighten over time.
Table of Contents
- Why Did Adobe Experience Manager Drop Support for PHP 7.4?
- What Are AEM’s Current PHP Requirements?
- How to Assess Your Current Environment Before Upgrading
- Step-by-Step Migration Process for AEM and PHP Upgrades
- Common Migration Issues and How to Handle Them
- Performance and Security Benefits After the Upgrade
- Dependencies and Compatibility Beyond Core PHP
- Frequently Asked Questions
Why Did Adobe Experience Manager Drop Support for PHP 7.4?
PHP 7.4 reached its end-of-life date in November 2022, ending security updates and maintenance from the PHP core team. adobe made the strategic decision to align AEM’s minimum supported version with this timeline, eliminating the burden of maintaining compatibility with an unsupported language version. This is a common pattern across enterprise platforms—staying on dead software creates technical debt, complicates security patching, and prevents developers from using modern language features and performance improvements.
The underlying reason is both technical and practical. PHP 8.0 introduced significant improvements including named arguments, match expressions, attributes, and constructor property promotion—features that allow AEM’s development teams to write cleaner, more maintainable code. Additionally, PHP 8 brought substantial performance improvements over PHP 7.4, meaning upgraded systems often run faster without code changes. However, the most critical driver is security: PHP 7.4 stopped receiving security patches in 2022, so running it in production creates an expanding attack surface that no amount of WAF rules can fully protect against.
What Are AEM’s Current PHP Requirements?
Adobe Experience Manager now requires PHP 8.0 as an absolute minimum, with PHP 8.1 and PHP 8.2 being the recommended versions for new deployments. If you’re planning a migration, targeting PHP 8.2 is the safest choice because it will remain supported longer than 8.0 (which reached security support limitations in 2024). The PHP 8.1 branch is a middle ground with moderate support coverage, but many hosting providers and cloud platforms are already beginning to deprecate 8.0.
A critical limitation: AEM may support PHP 8.2, but your hosting environment, CDN, or third-party extensions might not. For example, if you use a legacy caching plugin, SSL/TLS extension, or custom integration written for PHP 7.4, that code may not run on PHP 8.0 without modification. Some database connectors, session handlers, and encryption libraries have breaking API changes between PHP 7.4 and 8.0. You cannot simply flip the PHP version switch without auditing your entire stack—including custom code, installed modules, and external integrations—for compatibility.
How to Assess Your Current Environment Before Upgrading
Start by identifying exactly what version of PHP your AEM installation is currently using. This sounds obvious, but in complex environments with load balancers, multiple servers, or container deployments, the actual PHP version running can be inconsistent across nodes. Run `php -v` on each server, check your container images, and verify the version reported in AEM’s system console. Document not just the minor version (7.4.x) but also the specific patch level and any custom builds or extensions your hosting provider has installed. Next, audit your custom code and third-party extensions.
Export a list of all installed AEM packages, bundles, and connectors. For each one, check the vendor’s PHP compatibility statement—this information is usually in their release notes or documentation. Pay special attention to custom code written in-house: if your team built AEM extensions or integrations using procedural code patterns from the PHP 5 or early PHP 7 era, those patterns may not work on PHP 8.0. For example, code that uses `call_user_func()` with string function names, passes objects by reference without proper type hints, or relies on automatic type coercion will fail or behave differently on PHP 8.0. Run your codebase through a linter or static analysis tool (like PHPStan) set to PHP 8.0 level to catch these issues before they hit production.
Step-by-Step Migration Process for AEM and PHP Upgrades
The safest approach is to perform this migration in a staging environment first, mirroring your production configuration as closely as possible. If you’re on a hosting provider like Hostinger, WP Engine, or Adobe Cloud, request a staging copy of your instance with the same PHP version, database, and plugins. If you manage your own infrastructure, build a test VM with the same OS, web server, and extensions as production. Begin by updating AEM itself to the latest version compatible with PHP 8.0+. This usually means upgrading to AEM 6.5 Service Pack 15 or later, or AEM as a Cloud Service (which runs only on PHP 8+). Do not attempt to jump directly to PHP 8.2 if you’re on an older AEM version—follow Adobe’s documented support matrix, which often requires intermediate upgrades. After upgrading AEM, update all dependent libraries and packages.
Use Composer to refresh your dependency tree: run `composer update –no-dev` and resolve any conflicts. If your host or infrastructure restricts Composer access (some shared hosting does), work with your provider to allow this step or use a build server to generate the updated vendor directory locally, then upload it. Finally, perform a full site crawl and functional test in staging. Use a tool like Screaming Frog or a custom script to crawl every accessible page and check for 500 errors, fatal PHP errors, or white screens. Test critical workflows: login, content creation, publishing, preview, media uploads, and any custom forms or integrations. Many PHP 8.0 incompatibilities only surface under load or when specific features are used. If you find errors, address them in staging before touching production. Only after staging is fully stable and tested should you schedule a maintenance window and perform the production upgrade.
Common Migration Issues and How to Handle Them
One frequent issue is the removal of ereg() and similar regex functions in PHP 8.0. If your codebase or third-party plugins use ereg() instead of preg_match(), those calls will throw a fatal error. Similarly, PHP 8.0 removed the `each()` function in favor of foreach loops, and changed type juggling rules that can cause unexpected behavior in loose comparisons. A real-world example: code like `if ($value == “0”)` where $value is a string works fine on PHP 7.4, but on PHP 8.0 it may fail if strict type checking has been enforced or if the variable has been cast differently by dependency injection. Running your code through a PHP 8.0 compatibility check before upgrading is essential—tools like PHP 7 to 8 Migration Tools or static analyzers catch most of these patterns.
Another common problem: third-party libraries or integrations that haven’t been updated. If your AEM installation uses a custom data connector, CRM integration, or payment gateway library, and that library’s maintainer abandoned it after 2019, it likely won’t work on PHP 8.0. You’ll need to either find a newer replacement, fork and fix the library yourself, or work with a vendor who still actively maintains their code. Warning: don’t assume “it might work”—test explicitly. A payment gateway or authentication system that silently fails or behaves incorrectly on PHP 8.0 can cause real damage to your business.
Performance and Security Benefits After the Upgrade
PHP 8.0 and later versions are significantly faster than PHP 7.4, often delivering 15–25% performance improvements on the same hardware without any code changes. This means faster page load times, lower server CPU usage, and better ability to handle traffic spikes. For AEM specifically, this translates to quicker content rendering, faster publish-to-delivery pipelines, and reduced latency for API calls. If your organization runs on-premises infrastructure, the performance gain can reduce the number of servers you need, lowering hosting costs over time.
The security benefits are equally important. PHP 8.0 introduced stricter typing, better error handling, and several security-focused improvements like the removal of vulnerable functions. Your AEM instance will no longer accumulate security debt from an unsupported language version, and you’ll receive patches for any newly discovered PHP-level vulnerabilities. Additionally, third-party packages and AEM extensions will increasingly require PHP 8+, so upgrading ensures you can accept security patches and feature updates for years to come.
Dependencies and Compatibility Beyond Core PHP
Many AEM integrations rely on specific versions of supporting libraries: cURL for API calls, OpenSSL for encryption, ImageMagick for image processing, and database drivers for MySQL or PostgreSQL. When you upgrade PHP, these dependencies may need updating too. For example, some older versions of the MySQL extension that shipped with PHP 7.4 may not compile or function properly on PHP 8.1. Work with your hosting provider to verify that all supporting libraries, PHP extensions (curl, gd, openssl, pdo_mysql, etc.), and runtime components are compatible with PHP 8.0+.
Documentation and API integrations are another consideration. If your AEM instance connects to external services—Salesforce, Marketo, a custom API endpoint—verify that the client libraries you use support PHP 8.0. Some legacy SOAP clients or XML-RPC libraries have known issues on PHP 8.0. If you’re building new integrations as part of this upgrade, use modern libraries like Guzzle for HTTP requests or the native curl extension with proper type safety, which will ensure compatibility now and in the future.
Frequently Asked Questions
Can I run AEM on PHP 7.4 indefinitely if I manage my own security?
No. While you can technically keep PHP 7.4 running, you’ll miss security patches, encounter incompatibilities with new AEM features and third-party integrations, and eventually face a forced upgrade when critical dependencies stop supporting PHP 7.4. It’s far riskier and more expensive to rush an emergency migration later than to plan one now.
What’s the difference between PHP 8.0, 8.1, and 8.2?
PHP 8.0 introduced major language changes; 8.1 added enums and readonly properties; 8.2 improved performance and deprecated some legacy features. PHP 8.0 will reach security support end in 2024, while 8.2 has more runway. For new deployments, target 8.2; for legacy upgrades, 8.1 is often the practical middle ground.
Do I need to rewrite my AEM code to run on PHP 8.0?
Not necessarily. Much PHP 7.4 code runs unchanged on PHP 8.0, but you must audit for deprecated functions, type incompatibilities, and changes in error handling. A static analysis tool will flag most issues before runtime.
Can my hosting provider do this upgrade for me?
Partially. Your hosting provider can upgrade the PHP version on your server, but you are responsible for testing your code and applications for compatibility. Even managed hosts like Adobe Cloud or Pantheon require that you validate your custom code and extensions.
What happens if I ignore this and stay on PHP 7.4?
Your AEM instance will continue running until a critical security vulnerability is discovered in PHP 7.4, at which point you’ll be forced into an emergency upgrade with no time for proper testing. You’ll also lose access to new AEM features, experience integration failures as dependencies update, and face increasing isolation from the developer community and support ecosystem.
Are there tools to automate the PHP 8.0 migration?
Partially. Composer handles library upgrades, and PHP static analyzers like PHPStan can identify many compatibility issues automatically. However, you still must manually test every feature, custom extension, and integration. There is no tool that can guarantee a safe migration without human validation.
