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並前往https://crypt.codemancers.com/posts/2021-04-14-using-index-of-an-array-as-key-can-lead-to-bad-consequences/

Using Index of an array as KEY Can Lead to Bad Consequences

Ways of implementing keys and cases in which index can be used as key ... If we add elements to end of the array, Item 1 will have key 0 and ...

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