>Четверг, 9 декабря 2021, 8:22 +03:00 от André Hänsel <an...@webkr.de>:
>
>PHP 8 has named parameters in function calls, Kotlin has named parameters in
>function calls.
>
>Kotlin has this handy feature that you can put parameters with defaults
>before normal ones. Those parameters can then only be used by naming them.
>See also: https://kotlinlang.org/docs/functions.html#default-arguments
>
>This is very useful because I can add an optional parameter to a function
>and prevent users of my function from using the parameter in a positional
>way. This way I don't have to make a compatibility promise to never change
>the position of this parameter.
>
>If I try the same thing in PHP 8.0 I get a Deprecated warning and if I try
>it in PHP 8.1 I get something that I don't understand:
>https://3v4l.org/cg4DA
>
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I'll add that leading optional parameters are needed to implement currying and
partial application.
```
function foo(int $opt = 42, int $req) {}
$foo = curry(foo(...), 23);
// $foo = fn($opt = 42, $req = 23);
```
While this is not a popular practice in PHP, this deprecation notification
«breaks» all code that uses functional pradigm/concepts.
--
Kirill Nesmeyanov
