PHP | CachingIterator next() Function

The CachingIterator::next() function is an inbuilt function in PHP which is used to move the iterator to the forward.

Syntax:

void CachingIterator::next( void )

Parameters: This function does not accept any parameters.

Return Value: This function does not return any value.

Below programs illustrate the CachingIterator::next() function in PHP:

Program 1:

<?php

// Declare an array
$arr = array('G', 'e', 'e', 'k', 's');

// Create a new CachingIterator
$cachIt = new CachingIterator(
    new ArrayIterator($arr),
    CachingIterator::FULL_CACHE
);

foreach($cachIt as $element) {
    echo $cachIt->current() . " ";
    $cachIt->next();
}

?>

Output:

G e s

Program 2:

<?php

// Declare an ArrayIterator
$arr = array(
    "a" => "Geeks",
    "b" => "for",
    "c" => "Geeks",
    "d" => "Computer",
    "e" => "Science",
    "f" => "Portal"
);

// Create a new CachingIterator
$cachIt = new CachingIterator(
    new ArrayIterator($arr),
    CachingIterator::FULL_CACHE
);

foreach($cachIt as $key => $value) {
    echo $key . " => " . $cachIt->current() . "\n";
    $cachIt->next();
}

?>

Output:

a => Geeks
c => Geeks
e => Science

Reference: https://www.php.net/manual/en/cachingiterator.next.php