Change PHP Version on Shared Hosting Safely

Why Does PHP Version Matter?

PHP is an important part of many websites, especially WordPress websites.

The PHP version affects compatibility, performance and security.

Using an outdated PHP version can create security and compatibility problems, while moving to a newer version without testing can break older website code.

The goal is to use a supported PHP version that is compatible with your website.

Why Should You Update PHP?

Newer PHP versions can provide improvements in:

• Security
• Performance
• Compatibility
• Error handling
• Modern application support

However, old plugins, themes or custom PHP code may not work correctly with newer versions.

This is why PHP upgrades should be planned.

Check Your Current PHP Version

Before changing anything, find out which PHP version your website currently uses.

Your hosting control panel may provide a PHP version selector.

If you use WordPress, you can also find PHP environment information through WordPress tools.

Write down the current version before making a change.

Create a Backup First

Never change the PHP version of an important production website without a recent backup.

Make sure you can restore the website if something goes wrong.

For critical websites, test the PHP change on a staging environment first.

Check Plugin and Theme Compatibility

Review your WordPress plugins and themes.

Make sure they are updated.

Old plugins are more likely to contain code that is incompatible with newer PHP versions.

Do not keep abandoned plugins simply because the website appears to work.

Change PHP Version Through Your Control Panel

The exact interface depends on the hosting environment.

In cPanel-based hosting, a PHP selector or similar tool may allow you to choose the PHP version for a domain.

DirectAdmin environments can also provide PHP version management.

Select the required version and apply the change.

Test the Website Immediately

Do not change the PHP version and walk away.

Open the website and test:

• Homepage
• Important pages
• WordPress login
• WordPress dashboard
• Contact form
• Search
• Forms
• Shopping cart
• Checkout
• Important plugins

If the website is a business website, test the functions that directly affect customers.

What If the Website Breaks?

A PHP upgrade can expose outdated code.

If the website stops working, first identify the error.

Possible causes include:

• Outdated plugin
• Outdated theme
• Custom PHP code
• Incompatible library
• Incorrect server configuration

If necessary, temporarily switch back to the previous PHP version while you identify and fix the problem.

Do not treat the older version as the permanent solution if it is no longer supported.

PHP Memory Limit

Some websites also require an appropriate PHP memory limit.

However, increasing memory does not automatically fix compatibility problems.

If a plugin crashes because of incompatible code, giving it more memory will not make the code compatible.

PHP Version and WordPress Performance

A suitable modern PHP version can contribute to better performance.

But PHP is only one part of website speed.

Other factors include:

• Hosting resources
• Database performance
• Caching
• Images
• Plugins
• Theme
• JavaScript
• CDN

Do not expect a PHP upgrade alone to solve every performance problem.

Keep a Maintenance Routine

Review your PHP version periodically.

A simple maintenance routine can include:

• Checking the current PHP version
• Updating WordPress
• Updating plugins
• Updating themes
• Testing compatibility
• Checking website errors
• Reviewing hosting resources

Final Thoughts

Changing PHP versions is a useful hosting skill, but it should be done carefully.

The safest process is:

Backup → Update software → Test → Change PHP → Test again → Fix compatibility issues.

THE HOSTGURU customers using supported shared hosting environments can manage PHP versions through the available hosting tools, depending on the plan and server configuration.

Frequently Asked Questions