PHP | AppendIterator next() Function

Last Updated : 21 Nov, 2019
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The AppendIterator::next() function is an inbuilt function in PHP which is used to move the element into the next element. Syntax: 
void AppendIterator::next( void )
Parameters: This function does not accept any parameters. Return Value: This function does not return any value. Below programs illustrate the AppendIterator::next() function in PHP: Program 1: php 
<?php
 
// Declare an ArrayIterator
$arr1 = new ArrayIterator(array('G', 'e', 'e', 'k', 's'));
 
// Create a new AppendIterator
$itr = new AppendIterator;
 
// Append the ArrayIterator element
$itr->append($arr1);
 
// Display the current element of iterator
var_dump($itr->current());
 
// Use AppendIterator::next() function to
// move into next element
$itr->next();
 
// Display the current element of iterator
var_dump($itr->current());
 
?>
Output: 
string(1) "G"
string(1) "e"
Program 2: php 
<?php
 
// Declare an ArrayIterator
$arr1 = new ArrayIterator(
    array(
        "a" => "Geeks",
        "b" => "for",
        "c" => "Geeks"
    )
);
 
$arr2 = new ArrayIterator(
    array(
        "x" => "Computer",
        "y" => "Science",
        "z" => "Portal"
    )
);
 
// Create a new AppendIterator
$itr = new AppendIterator;
$itr->append($arr1);
$itr->append($arr2);
 
$itr->rewind();
 
while ($itr->valid()) {
    echo "ArrayIterator Key: " . $itr->key() .
    "  ArrayIterator Value: " . $itr->current() . "\n";
     
    $itr->next();
}
 
?>
Output: 
ArrayIterator Key: a  ArrayIterator Value: Geeks
ArrayIterator Key: b  ArrayIterator Value: for
ArrayIterator Key: c  ArrayIterator Value: Geeks
ArrayIterator Key: x  ArrayIterator Value: Computer
ArrayIterator Key: y  ArrayIterator Value: Science
ArrayIterator Key: z  ArrayIterator Value: Portal
Reference: https://www.php.net/manual/en/appenditerator.next.php

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