Set the environment of the event to production if it has not been overridden explicitly

[ste93cry]

According to getsentry/develop#169 the environment field is now always required. Since we have to maintain the compatibility we cannot just make the property non-nullable, so I added our very first deprecation of the 3.x series that will suggest users to always pass a string. I also changed the default of the option as per documentation

[stayallive]

👍

[stayallive]

Soooo actually there is some discussion about the actual value maybe needing to be production instead of default, see discussion in #php on discord. Let's hold of a little bit before merging.

[stayallive]

So that was quick: getsentry/develop@676ab2b

We should change it to use production not default by default and allow the user to pass null if they want to (https://discordapp.com/channels/621778831602221064/621964286952210432/766052439660560384):

server is not going to enforce a default and a user can explicitly set to null if they really want to (though that's probably not a super great idea)

I guess that postpones our first deprecation for a bit 😉

We should also not default to that value in the options but only when creating the event or preparing it for sending (whatever makes more sense) and leave it null in the options itself because: https://discordapp.com/channels/621778831602221064/621964286952210432/766053912247271484.

a reason not to set it by default in the options object is that later on a framework you wouldn't be able to tell if the user set something explicitly programatically and you'd be overriding in the integration. So maybe best is to leave this in the client when preparing the event

Although those 2 conflict a bit in a sense, but considering we should always try to send one I would go for null in options and default to production in the Event when the environment is null.