There is a large difference between PHP and Perl. The only similarity is that PHP uses a few things from perl, such as Perl-Compatible Regular Expressions. (preg_ functions)
Now, I doubt you were shut down strictly because of the language the script was coded in. If so, I would suggest moving.
However, you should ask if there was another reason. For instance, a bad section of code could have caused it to use 10%+ of the server resources, which, in this case, would merit a new script.
I would ask for a more complete explanation.