It would help if you can tell us a bit about how you use PHP and if you want to use Perl in a similar way.
- Do you use an MVC framework for PHP, or just in-line your code?
- Do you use separate templates (e.g. Smarty)?
- Do you use an O/R mapper for database access?
- Do you use an OO programming style?
- Do you use PHP wih CGI, or with something persistent like mod_php or FastCGI?