Compare UK Hosting
Last updated: 2026-03-16

What is PHP?

Definition

PHP (Hypertext Preprocessor) is a widely-used server-side scripting language that powers over 75% of websites, including WordPress, Drupal, and Laravel applications. It processes dynamic content, handles form submissions, connects to databases, and generates HTML pages on the server before sending them to browsers.

Why It Matters

  • Powers WordPress, WooCommerce, and most popular CMS platforms
  • PHP version affects website security and performance
  • Outdated PHP versions are security vulnerabilities
  • Newer PHP versions offer significant speed improvements
  • Many hosting features depend on PHP configuration

How It Works

When you request a PHP page, the web server passes it to the PHP interpreter. PHP executes the code—querying databases, processing logic, handling sessions—then outputs HTML. This HTML is sent to your browser. PHP runs on the server, so users never see PHP code, only its output. Modern PHP (8.x) is significantly faster than older versions.

Pros & Cons

Advantages

  • Powers most CMS platforms (WordPress, Drupal, Joomla)
  • Huge ecosystem of frameworks and libraries
  • Easy to learn for beginners
  • Excellent database integration
  • Supported by all web hosts

Disadvantages

  • Older versions have security vulnerabilities
  • Performance varies significantly by version
  • Code quality varies widely in ecosystem
  • Requires regular version updates
  • Some legacy applications don't support new versions

Common Misconceptions

  • !PHP is outdated (PHP 8.x is modern and performant)
  • !PHP is slow (Modern PHP rivals compiled languages)
  • !You need to know PHP to use WordPress (Only for custom development)
  • !All PHP versions are the same (Major performance and security differences)

Do You Need PHP? Checklist

Consider php if any of these apply to you:

  • Your host supports PHP 8.0 or higher
  • You can change PHP versions easily
  • PHP memory limit meets your application needs
  • Required PHP extensions are enabled
  • Error logging is configured for debugging
  • You're using a supported PHP version

Recommended Hosts for PHP

Kinsta

Always latest PHP with easy version switching

Read Review

SiteGround

PHP 8.x with ultrafast PHP

Read Review

Hosting.com

Multiple PHP versions with easy switching

Read Review
View All Provider Reviews

Frequently Asked Questions

Which PHP version should I use?
Use the latest stable version your applications support—currently PHP 8.2 or 8.3. PHP 8.x offers major performance improvements over 7.x. Check plugin/theme compatibility before upgrading WordPress.
How do I change my PHP version?
In cPanel, use "Select PHP Version" or "MultiPHP Manager". Some hosts offer this in their custom control panels. Always backup before changing versions and test your site afterward.
Why does PHP version matter for WordPress?
Newer PHP versions are faster (up to 3x improvement from PHP 7.0 to 8.2), more secure, and use less memory. WordPress officially recommends PHP 7.4+ and works best with PHP 8.x.
What is the PHP memory limit?
PHP memory limit (e.g., 256MB) is the maximum RAM a PHP script can use. Insufficient memory causes "Fatal error: Allowed memory size exhausted." WordPress recommends 256MB; complex sites may need more.
How do I know if a plugin supports my PHP version?
Check the plugin's WordPress.org page or documentation for PHP requirements. Quality plugins list minimum PHP versions. Test on a staging site before updating PHP on production.
What are PHP extensions?
PHP extensions add functionality—curl for HTTP requests, gd for image processing, mbstring for character encoding. WordPress requires several extensions. Most hosts enable common extensions by default.
Is PHP secure?
Modern PHP (8.x) is secure when properly configured. Security issues arise from: outdated versions (use supported versions only), poor code practices, or misconfigured servers. Keep PHP updated and use reputable plugins.

Related Terms

Need Help Choosing?

Use our calculator to find the perfect hosting plan for your needs.

Try Calculator
Back to Glossary