PHP | CachingIterator __construct() Function

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

// 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

// 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