How to display variables in SMARTY?

Question

Arrays

You need to display the smarti template variables and their values. for example, on the page of my order, I already inserted some code and received variables in the form of an array like:
$orders(array=> data( id => '1', sum => '222'), info(date => '01.03 .2015', sum => '222')
I got something like this, but I don't remember how I called this line, what command. Tell me good people,...