PHP | CachingIterator __construct() Function

Last Updated : 20 Nov, 2019
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The CachingIterator::__construct() function is an inbuilt function in PHP which is used to construct a new CachingIterator object for the iterator. Syntax: 
public CachingIterator::__construct( Iterator $iterator, int $flags = self::CALL_TOSTRING )
Parameters: This function accepts two parameters as mentioned above and described below:
  • $iterator: This parameter holds the iterator of cache.
  • $flags: This parameter holds the bitmask of flags.
Return Value: This function does not return any value. Below programs illustrate the CachingIterator::__construct() 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
);
 
// Display the result
foreach($cachIt as $element) {
    echo $element . " ";
}
  
?>
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
);

// Display the result
foreach($cachIt as $key => $value) {
    echo $key . " => " . $value . "\n";
}
  
?>
Output: 
a => Geeks
b => for
c => Geeks
d => Computer
e => Science
f => Portal
Reference: https://www.php.net/manual/en/cachingiterator.construct.php

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