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MultipleIterator::countIterators is a method in PHP's MultipleIterator class that is used to count the number of iterators that have been attached to the MultipleIterator object.

Here is an example that demonstrates the usage of MultipleIterator::countIterators:

php
$array1 = ['a', 'b', 'c'];
$array2 = [1, 2, 3];
$array3 = ['x', 'y', 'z'];

$iterator1 = new ArrayIterator($array1);
$iterator2 = new ArrayIterator($array2);
$iterator3 = new ArrayIterator($array3);

$multiIterator = new MultipleIterator();
$multiIterator->attachIterator($iterator1);
$multiIterator->attachIterator($iterator2);
$multiIterator->attachIterator($iterator3);

$count = $multiIterator->countIterators();
echo $count; // Output: 3 (number of attached iterators)


In this example, we create three ArrayIterator objects representing three different arrays. We then create a MultipleIterator object and attach the three iterators to it using the attachIterator method. Finally, we use the countIterators method to get the count of attached iterators, which returns 3.