Re: [VOTE] Named arguments

Hi, Rowan, ---- En dom, 12 jul 2020 14:19:08 +0200 Rowan Tommins <rowan.collins@gmail..com> escribió ---- > The problem with this, whether built in or not, is that you have to express everything with > strings rather than keywords. That means, for instance, that invalid values in the definitions > themselves will only error at run-time. The definitions also tend to get verbose pretty quickly. > > To make it concise and checked at compile-time, you need it to be a construct that pairs > identifiers to types without first representing them as strings, e.g. to write > ?string $foo = 'hello' rather than > 'foo' => ['type'=>'string', > 'nullable'=>true, 'default'=>'hello']. It turns > out we already have a construct for doing that: function signatures. > > If the input is an actual array or object coming from "outside", you're > probably going to want a more extensible validation system anyway. Those are really hard to design, > and probably best left to userland where people can choose the tradeoffs they prefer. > > Regards, > I see. However, with named arguments you also have to implement changes in parser in order to can recognize named arguments. You also have to change behavior about default parameters. I don't know if this change affect to performance, maybe do. By the other hand, editor like PHPStorm has "Inlay Hints": https://www.jetbrains.com/help/rider/Inline_Parameter_Name_Hints.html With a function which checks scheme, you also could use in other contexts, like forms: ``` $scheme = ['name' => 'string', 'surname' => 'string', '?age' => 'int'); $is_valid = array_check_scheme( $_POST, $scheme ); ``` You can use it even with JSON: ``` $request = json_decode( $request_json, true ); $scheme = ['name' => 'string', 'surname' => 'string', '?age' => 'int'); $is_valid = array_check_scheme( $request, $scheme ); ``` > e.g. to write ?string $foo = 'hello' rather than > 'foo' => ['type'=>'string', > 'nullable'=>true, 'default'=>'hello'] Maybe you don't need checked at compile-time. is it slow?, securely, but you don't use in everywhere. > you're probably going to want a more extensible validation system anyway. Maybe, in that case, userland libraries have a starting point. With XML parsing is the same. PHP provides basic functionality and userland provide advanced. Regards -- Manuel Canga