PHP Manual
CachingIterator
Return the key for the current element

CachingIterator::key

(PHP 5, PHP 7, PHP 8)

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

Description

public CachingIterator::key(): scalar

Warning

This function is currently not documented; only its argument list is available.

This method may return a key for the current element.

Parameters

This function has no parameters.

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