PHP

PHP is the server-side scripting language WordPress is built on. Every single WordPress site, theme, and plugin ultimately relies on PHP to process requests, generate dynamic content, and communicate with the underlying MySQL database.

What PHP Actually Does

• Processes requests on the server before a page is sent to a visitor's browser
• Communicates directly with the MySQL database to fetch and store content
• Generates dynamic HTML that changes based on the specific request or user
• Powers the theme and plugin systems that give WordPress its enormous flexibility

Why WordPress Chose PHP

PHP is free, open-source, and was already widely supported across virtually every hosting provider by the time WordPress was first built — a combination of accessibility and existing infrastructure that made it a genuinely practical choice at the time.

PHP Versions and Why They Matter

Newer versions of PHP tend to be significantly faster and more secure than older ones. Running WordPress on an outdated PHP version can measurably slow a site down and leave it exposed to known security vulnerabilities — keeping PHP updated, alongside WordPress core itself, is one of the more overlooked routine maintenance tasks.

Do You Need to Know PHP to Run WordPress

No — the vast majority of WordPress users never write a line of PHP themselves. It becomes genuinely useful the moment someone wants to build a custom plugin, make deeper theme customizations, or properly troubleshoot an error message referencing specific PHP code.