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Ask a question about PHP transactions

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Ask a question about PHP transactions

Current file a.php:
Transaction start
Database Operations 1

The following two lines operate the class method for a.php execution b.php:
Database Operations 2
Transaction rollback 1

Database Operations 3
Transaction rollback 2

Above conditions
Question 1: Is transaction rollback 1 valid?
Issue 2: Does transaction rollback 2 work for database operation 2?

------to solve the idea----------------------
Question 1: Is transaction rollback 1 valid?
Effective

Issue 2: Does transaction rollback 2 work for database operation 2?
Work

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