PHP | CachingIterator getInnerIterator() Function

Last Updated : 07 Mar, 2024
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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 
<?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 
<?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

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