Minify alternative pure php, (Assetic, Grunt, ?)

Minify alternative pure php, (Assetic, Grunt, ?)

i am building a website with Cakephp Framework and Bootstrap 3 for GUI.
Currently i use Minify 2.1.7 to combine and minify css and js files. When
i started playing with the idea to use Bootstraps's less files for more
flexibility and cleaner css code i researched more information about
Minify in order to combine it with a less parser. Unfortunately i found
out that Minify is said to be a great security risk and should not be
used. People recommend grunt or assetic instead. Both tools are very
complicated to use and afaik they are not php only but also require
certain binary support for parsers etc.
Is there a way to or a php-tool like Minify that can combine, minify and
and parse less?
Is there a way to use gruntjs, assetic or other tools for my usecase? (php
only)
Is Minify really such a security issue?