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PHP unlimited classification, thinkphp5.0 unlimited classification

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PHP unlimited classification, thinkphp5.0 unlimited classification There are many methods and functions on the Internet to implement this function, but they basically use recursive queries, otherwise the code will be long.
The disadvantage of using recursive queries is that if the classification level is too large or there are too many comments and replies, the number of database queries will increase dramatically
In this article you will learn about a brand new infinite classification implementation method, which can even achieve unlimited classification or unlimited reference reply functions with just one query

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