pdo attribute

we can set different attributes on pdo. let's see zend mock question for this .

Question:

When writing portable database code using PDO, what is the PDO::ATTR_CASE attribute useful for?

Answer:

1. None of the above
2. Ensuring that all columns are of a particular case when fetched
3. Adjusting the case of a query before it is processed for compatibility reasons
4. Controls the switch logic of how queries are processed
5. Allows you to adjust the memory cache (or "case") for increased performance
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