What Is PHP? — yttcom.net

A plain-English explanation of what PHP is, why it exists, and why yttcom.net uses it.

The short answer

PHP is a programming language that runs on a web server. You write PHP code, put it on a server, and when someone visits that URL, the server runs your code and sends the result back to them.

The person visiting never sees the PHP code itself — they only see whatever the PHP code chose to output.

Analogy: Think of a restaurant. The menu is what the customer sees (the webpage). The kitchen is PHP — it runs behind the scenes, processes the order, and sends back a result. The customer never goes into the kitchen.

What makes PHP different from HTML?

HTML is a static file — it always shows the same thing. PHP is dynamic — it can make decisions, read files, check passwords, talk to databases, and produce different output depending on the situation.

Hello visitor <?php // PHP — can say something different every time $hour = date("H"); if ($hour < 12) { echo "Good morning"; } else { echo "Good afternoon"; } ?>

Where does PHP run?

PHP runs on the server — not in your browser. This is important. JavaScript runs in the browser (on your phone or computer). PHP runs on the computer that hosts the website.

yttcom.net runs on a Namecheap shared server. When you call an endpoint like file_write.php, that code runs on that server — not on your phone.

What is PHP actually used for?

PHP is the backbone of most of the web. WordPress, Facebook (early versions), Wikipedia — all PHP. It is especially good at:

· Reading and writing files on the server
· Receiving data from a form or an API call
· Checking passwords and tokens
· Returning data as JSON to apps and scripts
· Connecting to databases

How yttcom.net uses PHP

Every endpoint on yttcom.net is a PHP file. When Claude runs a curl command to deploy a page, it is calling a PHP script on the server. That PHP script checks the token, figures out where to write the file, writes it, and sends back a JSON response saying whether it worked.

PHP is why the gym logger can save your workout data. PHP is why Builder can deploy HTML files without FTP. PHP is the engine behind every yttcom.net operation.

What does a PHP file look like?

<?php // Everything between these tags is PHP code // Lines starting with // are comments — ignored by PHP echo "Hello from the server!"; // This runs on the server and sends "Hello from the server!" // back to whoever called this URL ?>

Remember: The file extension is .php — the server knows to run PHP files through the PHP engine before sending the result. A .html file just gets sent as-is.

Do I need to install anything?

No. yttcom.net already has PHP installed and running. When you upload a .php file to the server, it just works. You write the code, upload it, and call the URL.