PHP | CachingIterator next() Function

Last Updated : 26 Nov, 2019
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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 
<?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 
<?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

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