abstract：(PHP 5 >= 5.5.0, PHP 7) Generator::valid — 检查迭代器是否被关闭
(PHP 5 >= 5.5.0, PHP 7)
Generator::valid — 检查迭代器是否被关闭
abstract：(PHP 5 >= 5.5.0, PHP 7) Generator::valid — 检查迭代器是否被关闭
(PHP 5 >= 5.5.0, PHP 7)
Generator::valid — 检查迭代器是否被关闭
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