How to do file io every 200kb in php

Here is a log analysis program, which includes file reading and writing, file_put_contents, fgets, and the load data local infile of the database. Load the database from the file. How to make the file size reach 200kb for a database Write

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Judge the size of the file before writing it. If it reaches 200kb, write the original one to the database and then write the file

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