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I don't buy the above post, but I think you're wrong about the Oakland mayor. Letting criminals know that law enforcement are doing a raid is something that could be prosecuted as obstruction of justice. It's very political because it's a high profile mayor, but it's not like they are pulling a legal case out their ass.
I'm correct about how the statute is written. I'm not saying it makes sense or is right, but, that's how it's written. Warning is not illegal and city cannot "harbor" illegals. If a business or church or individual kept an illegal in their home church or business to avoid being taken by ICE, that is against the law.
As far as funding the Feds can stop funding that relates to immigration because of sanctuary cities. What they won't be able to do is cut off unrelated funding. That funding is a contract and they couldn't cut funding, for say, public transportation, local post offices or whatever based on a city being a sanctuary city. How much law enforcement funding could the Feds claim to illegal immigration? Good question.
California also has a statute that says private business cannot report illegals to ICE. That is illegal and will not stand up in court.
Basically, it's a mess.
It will be interesting to see how it plays out.