If you run a website, there's a quiet component working behind the scenes that you almost never think about: the version of PHP that runs on your hosting. PHP is the programming language that powers WordPress, Joomla, Magento, PrestaShop, and the vast majority of the sites on the Internet. When someone visits your page, the server executes PHP code to build the HTML that the visitor eventually sees. On a site with traffic, that process happens dozens of times per second, so the PHP version you use is far from a minor technical detail: it shapes how fast your site responds and how exposed it is to attacks.
The problem is that a huge number of sites keep running on old PHP versions without the owner ever noticing. It works, it loads, it looks fine… so nobody checks it. But under the hood it might be running PHP 5.6 or 7.2, versions that no longer receive updates and that leave both speed and security on the table. In this guide I'll explain why keeping PHP up to date matters, how to figure out which version you're on, and how to change it from cPanel without breaking anything.
What PHP is and why the version matters so much
PHP is a server-side language. That means it runs on the machine where your site lives, not in the visitor's browser. Every time WordPress builds a blog post, queries the database, applies your theme, and returns the page, it's running PHP. Because it's the engine underneath everything, any improvement to that engine shows up across your entire site at once.
New PHP versions aren't just "more recent" — they're considerably faster. The jump from PHP 5.x to PHP 7 already doubled performance in many cases, and the 8.x versions kept refining the internal virtual machine, memory management, and how the code compiles. In practice, moving a site from PHP 7.2 to PHP 8.1 or 8.2 can clearly cut response times, use less CPU, and handle more visitors on the same plan. And all of that happens without touching a single line of your content.
Speed: less waiting for the visitor
A faster website isn't a luxury. Google uses speed as a ranking signal, and visitors abandon pages that take more than two or three seconds to load. If your online store or your blog runs on a modern PHP version, every request is processed in less time, the server frees up resources sooner, and the whole site feels snappier. When you combine a current PHP version with a stack built for speed — for example, servers running LiteSpeed and caching — the difference against an old configuration is noticeable.
Security: old versions stop getting patches
This is the most serious point. Every PHP version has a life cycle: it gets active support for a while, then security patches only, and finally reaches end of life. From that moment on, if a new vulnerability appears, nobody is going to fix it. Your site is left with an open door that automated attackers know about and scan for at massive scale. Many WordPress infections, code injections, and defacements start exactly there: in an outdated component that no longer receives corrections. Keeping PHP on a version with active support is one of the cheapest and most effective security measures there is.
Compatibility: new plugins and themes require it
There's a third, quieter reason. The ecosystem keeps moving. Modern plugins, themes, and frameworks start demanding higher minimum PHP versions, and if you fall behind, sooner or later you won't be able to install or update something you need. Staying current saves you from that dead end where a key tool "isn't compatible with your PHP version."
How to check and change the PHP version from cPanel
The good news is that on a decent host this takes a couple of clicks — no code, no support ticket required. The tool is called, depending on the panel, the PHP Version Selector or "MultiPHP Manager," and it lives inside cPanel. The typical path looks like this:
- Log into your cPanel with your hosting username and password.
- Find the software section and open Select PHP Version or MultiPHP Manager.
- There you'll see your current version and a dropdown with the available ones (for example 7.4, 8.0, 8.1, 8.2, 8.3).
- Pick a modern version that still has active support and save the change.
- On the same screen you can enable or disable PHP extensions if a plugin needs them.
The change usually applies instantly. After that you just have to open your site, browse the main sections, and confirm that everything looks and works fine.
The key precaution: test before you jump
Updating PHP almost always goes smoothly, but every now and then an old plugin or an abandoned theme uses functions that newer versions have already removed. To avoid a surprise in production, follow this order:
- Make a full backup of the site and the database before touching anything. If something goes wrong, you restore and you're done.
- If your host allows it, create a staging environment (a test copy) and change the PHP version there first.
- Move up one step at a time: if you're on 7.4, try 8.0 or 8.1 before jumping straight to the newest.
- Update WordPress, the plugins, and the theme first, so you reach the PHP change with everything current.
- Check the error log after the change to catch any compatibility warnings.
Signs that you're on an old version
How do you suspect your PHP has fallen behind without being technical? Watch for these clues:
- The WordPress dashboard shows a notice like "your PHP version is outdated" or "we recommend updating PHP."
- A plugin or theme won't install because it "requires a higher PHP version."
- The site feels slow even with few visitors and nothing strange in the database.
- Warnings or "deprecated function" messages appear on screen or in the logs.
- Nobody has touched the server configuration in years, and you don't even know which version you're on.
Any of these signs is reason enough to head into cPanel and take a look. In practice, it's one of those maintenance tasks that pays off enormously: five minutes of work that translate into more speed, less risk, and fewer headaches down the road.
At the end of the day, what makes the difference is having a host that has your back. When we tried BanaHosting for this review, we found that the PHP version selector inside cPanel lets you choose your version with a single click, that daily backups give you a safety net to test without fear, and that Spanish-speaking support is there to lend a hand if a compatibility question comes up. That combination — being able to pick the version easily, having backups on hand, and real people who answer — is exactly what turns keeping PHP updated from something intimidating into just a healthy part of your site's routine.