Creation of new process for each request of web page?

It might be a basic question but everytime a user call a php file from a server, does it create a new process from that server ?

For example, I have a basic form (let's say on index.php) that submits a text to another php file. In that php file, I print the posix_getpid().

I opened in two tabs my index.php an filled in and submitted a text and I ended up with two different pid on each tab.

Which lead me to the conclusion that a server probably create a new process for each script. Am I right ?

Cheers !