How to Check Your PHP Version and Find Security Updates
Check which PHP version your website really uses, verify support and security releases, and plan safer PHP updates without disrupting your site.
How to Check Your PHP Version and Find Security Updates
To check your PHP version, run php -v in a terminal, check the PHP setting in your hosting dashboard, or inspect your application’s server information. Then compare the full version number with the official PHP support schedule and PHP change log. The key is to check the PHP version serving your website—not just the command-line version installed on the machine.
Hypothetical example: Imagine that Maya maintains a small WordPress store hosted in the United States. Her hosting panel reports PHP 8.3.35, but a terminal on the server reports PHP 8.4.26. These are example values, not observations from a live website. Here is how she can find the version that matters and decide whether an update is needed.
1. Check the PHP version from a terminal
If you have SSH access to the server, connect and run:
php -vThe first line normally identifies the PHP command-line interpreter and its full version. Record all three numbers: for example, 8.4.26 is not the same patch release as 8.4.25. On Windows, run the same command in PowerShell or Command Prompt if PHP is on your PATH. If the command is not found, you may need your host’s control panel or the absolute path to PHP.
Why the terminal result can differ from the website
A server can have multiple PHP versions, including separate command-line and web-server configurations. To see which executable your shell uses, run:
command -v php
php --iniThe second command identifies the configuration files loaded by that CLI executable. A different PHP-FPM pool or web-server handler may serve the website. In Maya’s hypothetical case, the differing 8.3 and 8.4 results would be a reason to investigate, not proof that either installation is broken.
2. Verify the PHP version serving the website
For a site you control, the PHP function phpversion() returns the version used by the request. In a protected development environment, create a temporary PHP file containing:
<?php
echo htmlspecialchars(phpversion(), ENT_QUOTES, "UTF-8");Load that file through the same web server and virtual host as the application. Remove it immediately after checking. If a version-only endpoint is unnecessary, use your host’s administration interface instead. Avoid leaving a publicly accessible phpinfo() page: PHP documents that it can reveal paths, environment values, loaded modules, and other sensitive configuration details.
3. Check PHP in WordPress or your hosting dashboard
In WordPress, open Tools → Site Health → Info → Server and look for the PHP version field. Many hosting dashboards also have a PHP selector or configuration page for each domain. Menus vary by host, and the host’s selected version should be checked against the version actually executing website requests.
For Maya’s example, if WordPress reports 8.3.35 while SSH reports 8.4.26, she should evaluate the 8.3 branch used by the live store. Updating CLI PHP alone would not necessarily update the web runtime.
4. Check whether your PHP branch still receives fixes
As of October 21, 2026, PHP lists versions 8.4 and 8.5 in active support, while 8.2 and 8.3 receive critical security fixes only. PHP 8.2 is scheduled to reach end of security support on December 31, 2026; PHP 8.3 on December 31, 2027; PHP 8.4 on December 31, 2028; and PHP 8.5 on December 31, 2029. Check the live supported-versions page before planning an upgrade.
An actively supported branch can still require a patch update. Do not assess security solely from “PHP 8.4” or “PHP 8.5”: compare the complete patch version with vendor releases. Also check whether your Linux distribution or hosting provider backports fixes without changing the upstream-looking version string.
5. Review official security announcements before updating
Read PHP.net announcements and the PHP 8 change log for the affected versions, bug descriptions, and fixed releases. The PHP project announced on October 20, 2026 that it planned a critical security release for October 21 at 14:00 UTC (10:00 a.m. EDT), involving two vulnerabilities rated CVSS v4.0 9.2. At the time of this article’s assigned publication slot, the detailed advisory and fixed version numbers had not yet been published; do not treat an unverified CVE number as confirmed.
When a security release becomes available, verify the published affected-version ranges and compare them with the runtime that serves your site. Check your operating-system vendor’s security notices if PHP comes from a distribution package. If you use a managed host, ask whether the relevant fix has been deployed.
6. Apply updates safely and confirm the result
- Back up: Save website files, database, configuration, and an appropriate restore point.
- Check compatibility: Review your CMS, plugins, dependencies, extensions, and PHP migration documentation.
- Test: Apply the planned PHP update in a staging environment; exercise checkout, login, email, cron tasks, and admin workflows.
- Deploy: Use your supported hosting panel or operating-system package manager. Avoid mixing package repositories or replacing system binaries by hand.
- Verify: Recheck the website runtime, review logs, and test critical journeys. Keep a documented rollback plan.
In the hypothetical store, Maya would first confirm the website’s PHP 8.3.35 runtime, review the official advisory after publication, then ask her host whether an affected build needs a security patch. She could separately plan migration to an actively supported branch after compatibility testing. The upgrade decision depends on verified advisories and the provider’s packages—not on the terminal version alone.
Common questions
Does php -v show the version my visitors use?
Not necessarily. It shows the command-line PHP executable. A website can use a different PHP-FPM pool, Apache module, container, or hosting configuration.
Is the newest major PHP version always the safest immediate choice?
Use a supported, patched release compatible with the application. Test major or minor upgrades before production; do not deploy release candidates on a live site.
Should I keep a phpinfo page online for monitoring?
No. The output can expose detailed server configuration. Prefer authenticated hosting tools and remove temporary diagnostic files immediately.
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