CachingIterator::key

(PHP 5, PHP 7, PHP 8)

CachingIterator::key — Return the key for the current element

說明

public CachingIterator::key(): scalar
警告

本函數(shù)還未編寫文檔，僅有參數(shù)列表。

This method may return a key for the current element.

參數(shù)

此函數(shù)沒有參數(shù)。