add `pre_add_option` filter

[flixos90]

get_option() and update_option() already have filters to short-circuit their respective processes, so I think a similar filter should be added to add_option() as well.

[flixos90]

37928.diff​ is a first take on introducing the filter. I used null as a return value to skip since null is very unlikely to be stored as option. However, it is not a perfect solution I think. I was wondering whether it might make sense to declare a WP_DEFAULT_VALUE constant, fill it with some random value, and use that in such cases.

[jipmoors]

I would prefer to have a separate filter to allow a short-cicuit instead of abusing a return value to imply such a behaviour.

And a random value really sounds like a terrible idea :)

[flixos90]

Replying to jipmoors:

I would prefer to have a separate filter to allow a short-cicuit instead of abusing a return value to imply such a behaviour.

Definitely makes sense. I patched this way too quickly. :)

[flixos90]

37928.2.diff​ adds a dedicated filter to short-circuit the process of adding an option.

[johnjamesjacoby]

Related: #39286

[gerardreches]

Was this enhancement never added?

Trac ticket: #37928

[sainathpoojary]

Refreshed the patch to apply cleanly against current trunk.