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Which PDO attribute should be set so query failures raise exceptions?

A PDO::ATTR_ERRMODE set to PDO::ERRMODE_EXCEPTION
B PDO::ATTR_PERSISTENT
C PDO::ATTR_TIMEOUT
D PDO::ATTR_CASE

Answer

PDO::ATTR_ERRMODE set to PDO::ERRMODE_EXCEPTION

Without it, failures can be silently ignored and the code continues with a false return value, producing confusing downstream errors.

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