User mail on PHP

I do know that it's possible to access user information inside a PHP box with

$user = JFactory::getUser()

And that it's possible to access variables with

$this->get("var_name")

But how do I get the {user} variable inside PHP?

With the first bit of code you gave. {user:} gives you the exact same data.

So I can't get {user}, inside PHP, like I can get a variable with $this->get()?

I do know that it's possible to access user information inside a PHP box with

$user = JFactory::getUser()

You answered your own question before you even asked it

Yes, I do understand that.
But JFactory is from Joomla. {user} is from Chronoforms. I just want to know if it is possible to get the {user} (from Chronoforms) object and not the Joomla object. Eventually, Chronoforms could use the Joomla object and add more stuff to make the {user}, I just can't know this if I use the Joomla object directly.
When using Chronoforms, I like to use Chronoforms syntaxes, objects, variables, insted of using Joomla API, PHP native methods etc.

Thank you very much for you patience.