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PHP unlimited classification method class

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PHP unlimited classification method class

An example of unlimited classification in PHP, including creating databases and tables

Advantages of this classification method:

1, the database structure is simple, with only three fields: cid parentid name, without any redundant fields
2, no recursive query is used, all operations only require one sql statement
3. After all data is read from the database once, it is analyzed and processed in the array to save database server resources

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