What will be the best practice to fetch data from MSSQL and insert/update to MySQL?

So, i'd like to fetch data from MSSQL and insert/update in MySQL.
I have this script:

Should i create an array and insert whole the array in MySQL, is that possible?
Or should i iterate the fetched array and insert it into MySQL row by row?
I have this in mind:

What will be the best way?


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