Updating PHP for More Secure Web Apps

Updating PHP remains one of the most efficient ways to safeguard critical applications against security threats. Despite this, many teams frequently delay updating PHP versions to avoid breaking changes or downtime. This decision leaves their businesses exposed to vulnerabilities and increasing compliance and operational pressure.

In this blog, I walk through the importance of updating PHP and outline a few methods teams can take to make sure they’re deploying current versions. I then discuss how full updates must go beyond PHP versions and address all technologies used within your web apps.

Expert Support for Updating PHP

Do I Need to Update PHP?

Yes, you need to update PHP if your application is running on an unsupported PHP version. Each new PHP version includes performance improvements and critical security patches, which means failure to update leaves your critical applications exposed to newly identified PHP vulnerabilities, malicious attacks, and other consequences.

How Updating PHP Impacts Application Security

Because they are accessible via browsers, public-facing web applications present easy targets for hackers and attackers. Even though most organizations use security measures, such as web application firewalls, these are often considered inadequate. 

Securing your system requires a multi-faceted approach designed for a worst-case scenario:

• Writing code with a security-first mindset
• Deploying modern infrastructure and security tools
• Utilizing security-hardened configurations
• Updating all technologies to the most current versions

While each of these PHP security best practices are critical, many teams don’t have the luxury of building their applications from the ground up. Instead, they inherit existing web apps, often legacy systems, and often riddled with complex, outdated, and undocumented processes and technologies. This includes running end of life (EOL) PHP versions.

EOL vs. Supported PHP Versions

Making the right security decision means understanding where your web application sits within the PHP lifecycle. Each PHP release is actively maintained for a limited period before being designated EOL.

• Supported PHP versions receive full community support for two years, then two years of community security-only support.
• EOL PHP versions no longer receive updates, security patches, or improvements of any kind.

Deploying EOL PHP means your application is exposed to publicly documented security flaws with no path to remediation. The only option to guard critical web applications is to utilize third-party PHP long-term support (LTS) or update PHP versions.

Does PHP Update Automatically?

In the majority of cases, PHP does not update automatically. The assumption that it does is a common reason that web applications fall behind on critical security fixes.

PHP is tightly coupled with your operating system, web server, and application stack. Because updating can introduce breaking changes, automatic updates are typically avoided. While this helps protect application stability, it also means PHP versions remain unchanged for long periods.

There are a few exceptions to this rule. Some hosting providers may apply minor updates within the same release (for example, providing security patches for PHP 8.2). However, major version upgrades (such as migrating from PHP 7.4 to 8.2, 8.3, 8.4, or 8.5) almost always require manual planning, testing, and deployment.

In enterprise environments, automatically updating PHP versions is especially rare. Teams often freeze runtime versions to preserve stability, meet audit requirements, or support legacy applications. Over time, these freezes become permanent, and PHP reaches EOL without triggering alerts or warnings, creating a dangerous gap:

• PHP continues running without security patches
• Public vulnerabilities accumulate
• Applications appear stable but are increasingly and more severely exposed

Your team must take ownership of updating PHP as a part of your ongoing security strategy. Regular reviews, lifecycle tracking, and PHP update planning are essential, and failure to account for these factors can leave you vulnerable to dangerous — and expensive — PHP exploitation.

How Do I Update PHP Versions?

Updating PHP can range from a straightforward upgrade to a complex project, depending on your application, dependencies, and infrastructure. Regardless, there are a few basic steps you can take and resources you can use to successfully update PHP.

To help ensure the highest levels of security, the PHP community releases updates to supported PHP runtimes every four weeks. These will occur more often if a critical security vulnerability is disclosed. So, when you are considering updating PHP runtimes, you can:

• Manually review the PHP downloads page to get the latest software updates
• Manually get updates from the PHP repositories provided by your distribution, hosting provider, or other source
• Manually review the National Vulnerability Database (NVD) for the latest information about all known security vulnerabilities, including those related to PHP, then download the needed updates from the community PHP downloads page
• Work with a third-party source, such as Zend, to help plan and support major upgrades

Update PHP Versions Using Your In-House Team

Updating PHP using in-house resources gives teams full control over the upgrade process, but it also requires intensive planning, testing, and ongoing oversight. This approach is most common in self-managed or highly customized environments where application stability is a top priority, and it usually involves:

• Assessing compatibility by identifying deprecated functions, removed features, and PHP behavior changes that could impact the application
• Reviewing PHP dependencies such as frameworks, libraries, and custom extensions for PHP version support
• Testing thoroughly in development and staging environments using functional, performance, and security tests
• Deploying and monitoring in production to catch errors, performance issues, or regressions early

Many teams are tempted to manually update PHP themselves, as this method offers flexibility and control. However, manual updates are time-consuming and can be difficult to sustain, particularly when handling things on your own. This is particularly true for legacy or business critical web applications with complex dependencies.

Update PHP With Third-Party Support

Many organizations don’t have in-house developers who specialize in PHP.

Or, if they do, those experts simply don’t have the bandwidth to invest in effectively updating PHP, because their focus is on higher-priority projects that drive business value. This is particularly true for applications requiring incremental upgrades to a new PHP series.

In this scenario, or where developer attention is required for other tasks, bringing in expert PHP support from a trusted third-party can be your best option. For instance, the Zend Professional Services team has over one hundred years of combined PHP experience, and we can help you:

• Ensure business continuation while updating PHP versions
• Update PHP without breaking compatibility
• Provide PHP Long-Term Support to backport security patches and keep older PHP versions secure
• Centralize PHP configuration and monitoring
• Provide expert guidance for planning and implementing complex migrations, including for enterprise applications

Of course, working with a third-party often comes with a higher upfront cost than updating PHP manually. However, as my colleague and Manager of Professional Services Adam Culp pointed out in a recent webinar on the hidden costs of enterprise application modernization: 

“I can’t tell you the number of companies that I’ve talked through their modernization efforts – often, they’ve spent millions of dollars modernizing an application, only [to get derailed] and leave it sit in a corner somewhere as they go back to the using the legacy application.”

By working with a team of PHP experts from the beginning, you will spend less and complete your update sooner than attempting to manually update on your own.

Explore Services for Updating PHP

Access Secured, Updated PHP Versions With ZendPHP

If your team needs secure PHP but can’t afford frequent, disruptive updates, ZendPHP could be your best solution. Our fully secure PHP runtimes provide supported, enterprise-grade environments and include PHP LTS for community versions that have reached EOL.

Additionally, ZendPHP delivers backported security patches and bug fixes for supported and EOL PHP versions. This protects web apps from known vulnerabilities by extending your update runway considerably without forcing immediate refactoring — which means you can update on your schedule instead of constantly racing community support timelines, all without compromising the security of critical or legacy applications.

Best of all, installation is easy, and ZendPHP only takes a few minutes to install using the Package Manager. You can find details for your specific system in the ZendPHP documentation.

Learn More About ZendPHP Runtimes

Addressing Outdated Technologies Beyond Updating PHP Versions

Updating PHP is just one piece of a total application modernization project, as most modern web apps depend on a broad ecosystem that must also be maintained. Yours may include:

• Frameworks (Laravel, Symfony, CodeIgniter, etc.)
• Third-party libraries and packages
• Custom extensions and integrations
• Build tools, CI/CD pipelines, and monitoring systems

These are just a few examples of what may need updating within your web application, with each technology introducing their own security vulnerabilities, even when the PHP itself has been fully updated. By making sure you are using the most up-to-date version of all elements within your PHP stack, you reduce compatibility issues, simplify maintenance, and create a stronger security posture.

Zend Server EOL

Let’s take a look at a real-world example: Zend Server, which reaches EOL at the end of 2027. 

While Zend Server has long been used to manage and run PHP applications in enterprise environments, continuing to deploy it after EOL will introduce the same risks as using an unsupported PHP version: no security patches, growing compliance exposure, and increasing operational risk.

In this scenario, the best option is to migrate your application to ZendPHP (combined with the ZendHQ extension) or take advantage of the Zend Enterprise Web Platform (an all-in-one solution for secure, scalable, and observable PHP). In either scenario, the transition will allow you to address Zend Server EOL while also modernizing your broader PHP environment and without forcing rushed application rewrites.

Final Thoughts

Whether you choose to update PHP in-house or rely on expert third‑party support, the key is to take a proactive approach. Regular lifecycle tracking, disciplined testing, and long‑term planning will allow your team to modernize without sacrificing stability.

At the same time, updating PHP should not happen in isolation. Outdated frameworks, runtimes, and platforms — such as the upcoming Zend Server EOL — create risk across the entire application stack. Addressing all underlying technologies together strengthens security, simplifies maintenance, and ensures your applications remain reliable well into the future.

Additional Resources

• On-Demand Webinar – Strategies for a Seamless Modernization Journey
• Guide - Developing Web Applications With PHP
• Blog – Modernizing Legacy Applications in PHP
• Blog - PHP Monolith to Microservices: When to Split Web Apps
• White Paper - The Hidden Costs of PHP Upgrades