PHP difference when instantiating a new object?

Question

I have seen in many websites showing examples of instantiating objects.

$obj = new foo;

which is straight forward, but I have also seen this:

$obj = new foo();

is there a difference? So far I noticed both do the same.

Answer 1

There is no difference, it is a matter of opinion. If foo had a constructor with parameters you would need to use new foo($param);