PHP | AppendIterator __construct() Function

Last Updated : 21 Nov, 2019
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The AppendIterator::__construct() function is an inbuilt function in PHP which is used to construct an AppendIterator. Syntax: 
public AppendIterator::__construct( void )
Parameters: This function does not accept any parameters. Return Value: This function does not return any value. Below programs illustrate the AppendIterator::__construct() function in PHP: Program 1: php 
<?php

// Declare an ArrayIterator
$arr1 = new ArrayIterator(array('G', 'e', 'e', 'k', 's'));
$arr2 = new ArrayIterator(array('f', 'o', 'r'));
$arr3 = new ArrayIterator(array('G', 'e', 'e', 'k', 's'));

// Create a new AppendIterator
$itr = new AppendIterator;
$itr->append($arr1);
$itr->append($arr2);
$itr->append($arr3);

// Display the result
foreach ($itr as $key => $val) {
    echo $key . " => " . $val . PHP_EOL;
}

?>
Output: 
0 => G
1 => e
2 => e
3 => k
4 => s
0 => f
1 => o
2 => r
0 => G
1 => e
2 => e
3 => k
4 => s
Program 2: php 
<?php

// Declare an ArrayIterator
$arr1 = new ArrayIterator(array("Geeks", "for", "Geeks"));
$arr2 = new ArrayIterator(array("Computer", "Science", "Portal"));

// Create a new AppendIterator
$itr = new AppendIterator;
$itr->append($arr1);
$itr->append($arr2);

// Display the result
foreach ($itr as $key => $val) {
    echo $key . " => " . $val . PHP_EOL;
}

?>
Output: 
0 => Geeks
1 => for
2 => Geeks
0 => Computer
1 => Science
2 => Portal
Reference: https://www.php.net/manual/en/appenditerator.construct.php

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