Opening brace on new line after return type when argument list is split across multiple lines

[rhertogh]

I'm not sure if this already has been discussed, if so, please let me know.

Currently the Method and Function Parameters section defines a function argument list split across multiple lines in combination with a return type as such:

class ReturnTypeVariations
{
    public function anotherFunction(
        string $foo,
        string $bar,
        int $baz,
    ): string {
        return 'foo';
    }
}

However, when the definition get bigger with for example default values and interfaces as return types, it becomes (IMO) less readable:

class ReturnTypeVariations
{
    public function anotherFunction(
        string $foo,
        string $bar,
        int $baz='default value',
    ): MyVeryLongCustomInterace {
        $myVar = 'inititial value';
    }
}

My proposal would be to place the opening brace on a new line when a function's argument list is split across multiple lines and a return type is specified:

class ReturnTypeVariations
{
    public function anotherFunction(
        string $foo,
        string $bar,
        int $baz='default value',
    ): MyVeryLongCustomInterace
    {
        $myVar = 'inititial value';
    }
}

Note that if no return type is specified, the opening brace must still be on the same line:

class ReturnTypeVariations
{
    public function anotherFunction(
        string $foo,
        string $bar,
        int $baz='default value',
    ) {
        $myVar = 'inititial value';
    }
}