[twitter-dev] Know the number of results only

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How do I get the number of results for a given search phrase? I don't
want the results themselves, I just want to know the size of the
results set for any given phrase. For example "jnni hinklebootmurgh"
returns 0 results, where "michael jackson" returns gazillions. How can
I get just the total number of results? I thought max_id might have
something to do with it, but evidently not.