PHP PDO MySQL Transaction code structure?

Some general notes: Don't use bindParam() unless you use a procedure that modifies the parameter's value Therefore use bindValue() . BindParam() accepts argument value as a referenced variable. That means you can't do $stmt->bindParam(':num', 1, PDO::PARAM_INT) - it raises an error.

Also, PDO has its own functions for controlling transactions, you don't need to execute queries manually.

I wouldn't prepare & execute the transaction statements. I'd use PDO::beginTransaction() , PDO::commit(), and PDO::rollback().

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