The CachingIterator::getInnerIterator() function is an inbuilt function in PHP which is used to return the iterator sent to the constructor.
Syntax:
Iterator CachingIterator::getInnerIterator( void )
Parameters: This function does not accept any parameters.
Return Value: This function returns an object implementing the Iterator interface.
Below programs illustrate the CachingIterator::getInnerIterator() 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 $element;           if($cachIt->hasNext()) {         echo ", ";     } }   ?> |
Output:
G, e, e, k, 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 . " => " . $value;           if($cachIt->hasNext()) {         echo "\n";     } }   ?> |
Output:
a => Geeks b => for c => Geeks d => Computer e => Science f => Portal
Reference: https://www.php.net/manual/en/cachingiterator.getinneriterator.php
