Few small business owners know which PHP version powers their website. That is normal, it is not their job, and as long as the site works, the question never comes up. The issue is that PHP follows a strict lifecycle, with precise end of support dates, and a version that reaches end of life stops receiving security patches entirely, even if a critical flaw is discovered after that date. PHP 8.1, still widely used, reached that end of life on December 31, 2025.

What a PHP end of life actually means

Every major PHP version goes through two phases after release: first about two years of active support, with bug fixes and security patches, then roughly two more years of security only support, where only critical flaws get fixed. Once both phases have passed, the version receives no maintenance at all. Any flaw discovered after that date will never be patched, no matter how severe. A site still running that version remains exposed indefinitely to any vulnerability identified afterward.

Where each version currently stands

As of when this article was written, PHP 8.1 has been end of life since December 31, 2025 and receives no updates whatsoever. PHP 8.2 is still maintained, but only in security support mode, and will reach its own end of life on December 31, 2026, just a few months away. PHP 8.3 is likewise in security only phase, with end of life set for late 2027. The most recent versions, PHP 8.4 and 8.5, are in full active support. These deadlines shift from one version to the next, so it is worth checking the official schedule regularly rather than relying on a date memorized once and for all.

Why so many sites remain on an outdated version

The most common cause is not negligence but shared hosting. Many hosting providers keep an old default version for a long time, because changing the PHP version on a shared server can break client sites that depend on behavior specific to that version. A WordPress site installed several years ago, running equally old plugins, can end up stuck on PHP 8.1 or an earlier version without any alert ever reaching the site owner.

The real risks, beyond the alarmist talk

An end of life PHP version is not dangerous the day after its support ends, but the risk grows with time. Every month past end of life potentially brings newly discovered vulnerabilities in the language itself, never patched for lack of an active maintainer on that branch. On top of that comes an equally important indirect issue: many WordPress plugins, PHP libraries and security tools gradually stop guaranteeing compatibility with versions that are too old, which can create unexpected conflicts or flaws as those third party components keep updating.

How to check your own version

For a WordPress site, the information is visible in the admin dashboard, under Tools then Site Health, in the server information section. For a custom PHP build, calling the phpversion() function in a temporary script gives the answer immediately. Most hosting panels, such as cPanel or Plesk, also display the active version in their PHP settings, often with the option to change it directly from the interface.

How to migrate without breaking the site

A PHP version upgrade is never entirely risk free, since every major version removes certain deprecated functions and sometimes changes default behavior. Good practice is to test the migration on a staging environment identical to the live site, with the same plugins and theme, before switching over the production environment. On WordPress, updating the core, the theme and all plugins to their latest versions before migrating greatly reduces the risk of incompatibility, since serious developers gradually adapt their code to new PHP versions.

Points to verify before publishing: confirm the exact end of life dates for PHP 8.1, 8.2, 8.3, 8.4 and 8.5 on the official PHP.net schedule at the time of publication, since these deadlines can be adjusted, and check that the described procedure for viewing the PHP version in WordPress still matches the current dashboard interface.