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To discuss an interesting question, why does the PHP manual call the array to be searched $haystack?

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To discuss an interesting question, why does the PHP manual call the array to be searched $haystack???
Mixed Array_search (mixed $needle, array $haystack [, BOOL $strict])

The dictionary, haystack Chinese means hay heap, why use this word to name it? Is it because the array you want to choose is like a pile of hay, each of which is pieced together?

It's very interesting, everybody discuss the discussion together!

------Solution--------------------
You can understand that.
------Solution--------------------
Find a needle (needle) from a pile of hay (haystack), not very image?
------Solution--------------------
haha yes Yes Ah!
The foreigner's thinking is really interesting!

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