In an app that I'm creating, I need to pass an unknown number of parameters to an unknown constructor of a class.
The class (+ namespace) is a string, that is in $class.
The parameters are in an array.

This application will be deployed over a couple of months, so we thought we could develop it already in PHP 5.6.
So I thought that the solution of this would be:

 $instance = new $class(...$args);

This is working...

But my collegues don't want to accept this, because the CI server does not understand this line of code.
Their solution would rather be:

 $reflect = new \ReflectionClass($class);
 $instance = $reflect->newInstanceArgs($args)

Now: both are working fine, so that's not the problem.
But my thought is that Reflection is slower then using other ways (like the PHP 5.6 splat operator).

Also the question: is reflection a good way, of should I use the splat operator from the moment the CI server does understand that line?