Php/docs/migration52.class-constants
来自菜鸟教程
New Class Constants
pdo:
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PDO::ATTR_DEFAULT_FETCH_MODE
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PDO::FETCH_PROPS_LATE
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PDO::FETCH_KEY_PAIR
Fetches a 2 column result set into an associated array. (Added in PHP 5.2.3)
spl:
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CachingIterator::FULL_CACHE
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CachingIterator::TOSTRING_USE_INNER
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SplFileObject::READ_AHEAD
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SplFileObject::READ_CSV
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SplFileObject::SKIP_EMPTY