How to replace certain values in an array without using for-loop?

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I have a very long array of length couple million. Say, A=[1;2;3;4;5;2;3;4;1;....] I have another array of different length (order of thousands to millions), we can call this second array B.

I would like to replace values in the first array with 0s if the value in A is present in B.

Currently, I have the following code to do it:

for i=1:length(B)
    A(A==B(i))=0;
end

However, I would like to get rid of for loop and make this as efficient as possible since the arrays that I am working with is very large, and this is only a very small portion of the entire code, which needs to be computable before I graduate.

Thank you in advance,