[RFC] [Discussion] Improve callbacks in ext/dom and ext/xsl View as Markdown

Hi Tim

Hi

I'm opening the discussion for my RFC "Improve callbacks in ext/dom and ext/xsl".
RFC link: https://wiki.php.net/rfc/improve_callbacks_dom_and_xsl

Some question that I believe are not answered:

$xpath->registerPhpFunctions([
  "foo" => ...
]);

$xpath->registerPhpFunctions([
  "foo" => ...
]);

Is this an error due to the duplicate definition or will the last 'foo' win?

The last 'foo' will win, such that you can override previous definitions.

$xpath->registerPhpFunctions([]);

Is this an error or a noop?

This is a no-op, just like it is the case in current PHP versions.

Would it make sense to deprecate passing a string as "Future Scope"? Simplifying the method signature would also allow to simplify the documentation in the long run and registering a string is trivially fixed by adding square brackets.

Maybe, although I personally don't hate it that much.

In fact looking at the existing documentation at https://www.php.net/manual/en/domxpath.registerphpfunctions.php, what's the difference between 'php:function()' and 'php:functionString()'?

The difference is in the returned result.
php:functionString() will case the result to a string automatically for you, while php:function() just returns the result as-is.

Best regards
Tim Düsterhus

Kind regards
Niels

Hi again

Hi internals

Hi internals

I'm opening the discussion for my RFC "Improve callbacks in ext/dom and ext/xsl".
RFC link: https://wiki.php.net/rfc/improve_callbacks_dom_and_xsl

Kind regards
Niels

I have extended the RFC. The new version of the document is 0.2.0.
Now not only do I propose to extend the existing registerPhpFunctions method, I also propose to add a registerPhpFunctionsNS method.
The latter would allow for a nicer syntax and a namespace-aware API that can help to avoid name clashes with many callbacks.

This means there are now two primary votes.

Kind regards
Niels

I've updated my RFC again based on some feedback I got privately.
The new document version is 0.3.0.
The change is that instead of registerPhpFunctionsNS I now have registerPhpFunctionNS that no longer uses an array argument, but has a signature of
function registerPhpFunctionNS(string $namespaceURI, string $name, callable $callable): void;
You can consult the diff on the wiki to get up to speed quickly.

Cheers
Niels