[chmod775]

You can get a much more powerful alternative for "free" if you support de-structuring assignments (in arguments).

JavaScript Example:

    function test({a,b,c}) {
        console.log(c,b,a)
    };
    
    test({
        a: 1,
        b: 2,
        c: 3
    });

If you have this there's really no need for named arguments anymore. If you add features to your de-structuring, your "named arguments" will have them too (things missing for JS specifically: optional objects, TS support to specify types for the destructured objects inline instead of repeating the entire thing).

[TekMol]

It is not more powerful. You cannot do this for example:

    function hello($name='Joe',$title='dear')
    {
        echo "Hello $title $name";
    }
    hello('Sue');

Try here: https://3v4l.org/6MZHh

With your object properties approach, you always have to use the variable "names".

[bmn__]

Mixing implicit positional and named parameters is a misfeature. The named parameters should have a distinct syntax like other systems do, e.g. :$ twigil.