abstract：(PECL apc >= 3.1.1) APCIterator::key — Get iterator key获取迭代器的键
(PECL apc >= 3.1.1)
APCIterator::key — Get iterator key获取迭代器的键
abstract：(PECL apc >= 3.1.1) APCIterator::key — Get iterator key获取迭代器的键
(PECL apc >= 3.1.1)
APCIterator::key — Get iterator key获取迭代器的键
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