VarDumper::exportClosure() not support arrow functions

[WinterSilence]

VarDumper::exportClosure() not support arrow functions:

$f = fn($x) => $x + 10;
VarDumper::export($f);

Additional info

Q	A
Yii version	2.0.43
PHP version	7.4
Operating system	any

[samdark]

https://github.com/yiisoft/var-dumper/blob/master/src/ClosureExporter.php from Yii 3 could be useful for ideas on how to fix that. It supports short closures.

[WinterSilence]

@samdark bad idea - "php": "^7.4|^8.0"

[samdark]

I haven't said that the library should be used. I've said there are interesting ideas there.

[WinterSilence]

@samdark why not https://github.com/jeremeamia/super_closure or https://opis.io/closure/3.x/ ?

[samdark]

1. SuperClosure is not maintained anymore.
2. We've initially used Opis for Yii 3 but then found that it doesn't work for a few edge cases we had and that the 4.x version will require FFI.
3. It is another dependency. We'd like to avoid it (especially considering that it's already implemented for Yii 3 and could be partially back-ported).