To get Perl to work with apache (the most used web server for a time), there were two options: the not-so-complicated cgi script which gets executed from scratch on every request, then there was mod_perl which required a lot of tinkering with apache configurations and writing your code in a different way.
Even with those two options, you can't just write some code in a page and execute it without some sort of itermediate code.
Thats why php became so popular, perl coders could pick it up in a day ($ and all) and all you have to do is write .php files to a server - with the bonus that you have a rudimentary templating system built-in to php.
There really isn't much more to it than that.
I vividly remember the first time a friend showed me PHP in the late 90s. You're saying I can just write a script that generates HTML and throw it in /foo/index.php and that's the whole thing?
It's wild that right up until Rails got popular, we were writing code that served billions of requests off of homebrewed MVC-ish PHP frankenframeworks.
That's not really a point against it, it's a great tool and it's a ton of fun, but I wish there was a way to use it that at least kind of sort of mapped back to traditional music notation, especially rhythm notation.