If your MySQL version is 3.22.5 or later, you can now INSERT multiple values / records in one single query. In most cases this is probably not useful but I recently found this out while trying to optimise my GIDTopsites script.
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How to insert records of data into more than 1 database table in MySQL at a time?
When I first started coding PHP scripts for myself, without researching further, I simply assumed that I had to INSERT data into multiple tables by inserting part of the data into 1 table, query that table to get that just inserted data’s record ID and then do another INSERT on the next table and so on.