Thanks to Martin Fousek, we now have support for Smarty Template Engine. He also wrote this blog post:
Base support of another PHP Framework in NetBeans is on the way. It's presentation framework Smarty which is well-known tool for separating application and visual logic. First versions of the support we just added to the development Update Center so should be available in plugins of every dev build of NetBeans IDE under the name "PHP Smarty Framework".
For now there are these functions for .tpl files:
Functions which aren't supported yet:
Please report all issues you find in NetBeans IssueZilla > contrib > Smarty, thanks.