The offsetExists purpose

# CachingIterator::offsetExists

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

CachingIterator::offsetExists — The offsetExists purpose

### Description

public CachingIterator::offsetExists(string `$key`): bool
Warning

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

### Parameters

`key`

  The index being checked.

### Return Values

Returns `true` if an entry referenced by the offset exists, `false` otherwise.

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