(PHP 5 >= 5.2.0, PHP 7)
CachingIterator::offsetExists — The offsetExists purpose
public CachingIterator::offsetExists ( mixed $index ) : void
This function is currently not documented; only its argument list is available.
index
The index being checked.
Returns true if an entry referenced by the offset exists, false otherwise.
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https://www.php.net/manual/en/cachingiterator.offsetexists.php