From what you have said I understand that you are calling php code inside perl code. (correct me if I am wrong).
If yes, then I hope that following URLs may help you:
http://search.cpan.org/~esummers/PHP-Include-0.2/lib/PHP/Include.pm
http://search.cpan.org/~karasik/PHP-0.11/PHP.pm
http://search.cpan.org/search?query=php&mode=all