In this post, you’ll learn why it’s essential to update PHP version in WordPress, how to do it safely, and what to check before and after the update.
If your WordPress site has been running smoothly, it’s easy to overlook something as technical as the PHP version it’s using. But here’s the truth: running an outdated PHP version is one of the biggest silent killers of WordPress performance, security, and plugin compatibility.
What Is PHP and Why Is It Important?
PHP is the programming language WordPress is built on. It powers everything from rendering your content to processing form submissions and plugin functions.
The PHP version running on your server directly affects how well your WordPress website performs.
1. Security Risks with Older PHP Versions
Older versions of PHP (like 7.4 or earlier) no longer receive official security updates. That means any vulnerabilities discovered in those versions remain unpatched, putting your site at risk of being hacked.
Benefits of upgrading:
- Protection from known exploits
- Reduced chances of malware infections
- Improved overall WordPress security posture
2. Speed and Performance Improvements
Newer PHP versions (like PHP 8.2 or PHP 8.3) are significantly faster than their predecessors. Sites running modern PHP often see up to 50% speed improvements, especially for dynamic or content-heavy pages.
A faster site also:
- Reduces bounce rate
- Increases conversions
- Helps improve SEO rankings
3. Plugin and Theme Compatibility
Developers are building plugins and themes to work with newer PHP versions. If your site is running on an older version:
- Some plugins may stop working
- Theme updates could break your layout
- You’ll miss out on new features and improvements
Updating PHP ensures your site is future-ready.
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How to Update PHP Version in WordPress (Step-by-Step)
Step 1: Check your current PHP version
- Go to Tools > Site Health > Info > Server
- Look for the line that shows PHP version
Step 2: Backup your website
- Use a backup plugin like UpdraftPlus or your hosting backup panel
- Download both the database and files
Step 3: Log into your hosting panel
- Go to your control panel (e.g., cPanel, Plesk, Site Tools)
- Look for the PHP version manager or “Select PHP Version”
Step 4: Switch to the latest stable version
- Recommended: PHP 8.2 or PHP 8.3
- Save the changes and wait a few seconds
Step 5: Test your website
- Check the front-end and dashboard
- Make sure key plugins (like forms, sliders, etc.) are working
What to Do If Something Breaks?
- Switch back to the previous PHP version temporarily
- Update plugins and themes — many are now PHP 8+ ready
- Contact your hosting support — they often help troubleshoot compatibility issues
Pro Tips Before You Update PHP
- Test the PHP update on a staging site first
- Review your site with a plugin like PHP Compatibility Checker
- Remove or replace outdated plugins that haven’t been updated in years
