(PHP 5, PHP 7)
ArrayIterator::valid — Check whether array contains more entries
public ArrayIterator::valid ( ) : bool
Checks if the array contains any more entries.
This function has no parameters.
Returns true if the iterator is valid, otherwise false
Example #1 ArrayIterator::valid() example
<?php
$array = array('1' => 'one');
$arrayobject = new ArrayObject($array);
$iterator = $arrayobject->getIterator();
var_dump($iterator->valid()); //bool(true)
$iterator->next(); // advance to the next item
//bool(false) because there is only one array element
var_dump($iterator->valid());
?>
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https://www.php.net/manual/en/arrayiterator.valid.php