New Class Constants

pdo:

• PDO::ATTR_DEFAULT_FETCH_MODE

• PDO::FETCH_PROPS_LATE

spl:

• CachingIterator::FULL_CACHE

• CachingIterator::TOSTRING_USE_INNER

• SplFileObject::READ_AHEAD

• SplFileObject::READ_CSV

• SplFileObject::SKIP_EMPTY