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I am doing a signup form with an INSERT SQL query using PDO. After this INSERT, I want to extract the userid (auto incrementing, primary key) that was just created, and INSERT it into another table (a “confirmation code” table)
But how can I make sure that this userid is not that of a second user who registered 1/1000th of a second later that the first user?
Should I find some way of locking the table? Should I use transactions?
lastInsertId()returns the identifier of the last row inserted on that connection, so concurrent users (with different connections to the database) will not interfere.