I like the idea of named parameters, that way you know what you pass into a method.

If you have lots of optional parameters and you need to set some of them.

function someFunction($parameter1, $parameter2 = null, $parameter3 = null)
{
}

To set only prameter 1 and 3 I need to do something like this in php7

someFunction(
	'Parameter1 value',
	null,
	'Parameter3 value'
);

Which I think is kinda smelly.

This is much better imho.

someFunction(
	parameter1: 'Parameter1 value', 
	parameter3: 'Parameter3 value
);

Then again I think this is most usefull when working with the database records and in that case it would be easier to pass the model into the method or use a method on the model.

Named Parameters