PHP | AppendIterator next() Function

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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 
   
// 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 
   
// 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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