CachingIterator::key
(PHP 5, PHP 7, PHP 8)
CachingIterator::key — Return the key for the current element
说明
public CachingIterator::key(): scalar
警告
本函数还未编写文档，仅有参数列表。
This method may return a key for the current element.
参数
此函数没有参数。
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