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Currently PDO::MYSQL_ATTR_FOUND_ROWS is supported as an option in the PDO
It would be even better if this option was additionally supported in the
$driver_options argument of PDO->prepare().
The reason being that the option can be applied only locally where needed, and not
in all statements executed by the current PDO object with the possibility of
wreaking havoc in larger applications that share a PDO connection object.
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Given CLIENT_FOUND_ROWS is a connection option that can be used with mysql_real_connect() only, there is no way to change its value on the fly, so this issue can be closed as not a bug.