[cURL] Add missing CURLE_* constants

[phansys]

TODO:

• Update ext/curl/sync-constants.php in order to keep CURLE_* constants up to date;
• Add tests;
• Determine if the target branch should be moved to PHP-7.4.

[phansys]

Determine if the target branch should be moved to PHP-7.2 since these constants are missing there.

Please, let me know if master is the right target for these changes or if should I target a previous stable branch.
Thank you in advance.

[nikic]

Probably 7.4 only, due to number of additions. cc @adoy

[nikic]

As we added many other curl constants in 7.3, I think targeting that version should be fine.

[phansys]

Done targeting 7.3. Thank you so much!

[nikic]

Hm, some of these constants (such as these two) are not relevant for end users, because the character conversion functionality is not exported by PHP (and won't be). I'm wondering whether or not we should still define them.

[phansys]

I don't know about the use case for these constants, but IMO we should blacklist them given your explanation.
If the extension isn't really capable to get this kind of errors, the only use case I can imagine is to compare error codes returned by userland code, maybe a library using the system's cURL library directly via passthru() or similar.

[phansys]

If the decision is to not include these constants, they must be added to IGNORED_CONSTANTS:

php-src/ext/curl/sync-constants.php

Lines 16 to 18 in 906331a

	const IGNORED_CONSTANTS = [
	'CURLOPT_PROGRESSDATA'
	];

[patrickallaert]

I also think they shouldn't be exposed.

[patrickallaert]

This should be updated to target PHP 8.1.

[cmb69]

I'm closing this PR due to inactivity. @phansys, feel free to rebase onto master, change the target branch accordingly and re-open.

Thanks for your work, anyway! :)