(PHP 5, PHP 7)
ArrayIterator::offsetExists — Check if offset exists
public ArrayIterator::offsetExists ( mixed $index ) : bool
Checks if the offset exists.
This function is currently not documented; only its argument list is available.
index
The offset being checked.
true if the offset exists, otherwise false
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https://www.php.net/manual/en/arrayiterator.offsetexists.php