PHP vs HTML: What is the Difference?

If you’re trying to build a dynamic website, you may have been led directly to PHP vs HTML.
Both of these are foundational technologies — a great example of an HTML/PHP site is WordPress.
But they’re also very different technologies.

What is HTML?
HTML is short for Hyper-Text Markup Language. It is a client-side markup language. What does that mean? It means that it’s a sequence
of code that your browser reads to determine how to display things like text and images.

What is PHP?
PHP is a back-end programming language, which stands for PHP Hyper-Text Processor (a recursive acronym). PHP is a programming language that is compiled by the server. The code that you write goes through the server and then produces HTML code.
The HTML code is then translated by the browser.

What is the Difference Between PHP and HTML?
PHP is a server-side programming language whereas HTML is a client-side markup language. They are used for entirely different things,
but because they are frequently used together, people may confuse the two.

WordPress is one of the most popular applications on the web that is designed
in PHP. If you know PHP, you can dig into the code of WordPress
(because it is open-source) and change the way that the application works.

Conclusion
The difference between PHP and HTML is a simple one. HTML is a client-side markup language that controls how a page looks and feels. PHP is a server-side programming language that controls the HTML, JavaScript, and CSS that is sent to the browser.

A front-end developer may only know HTML, CSS, and JavaScript. But a back-end developer will need to know both PHP and HTML to code in PHP.

Credit : https://hackr.io/blog/php-vs-html