PHP | Imagick setIteratorIndex() Function

<?php 
  
// Create a new imagick object 
$imagick = new Imagick( 
'https://media.geeksforgeeks.org/wp-content/uploads/20190918234528/colorize1.png');
  
// Add two more images in the same imagick object 
$imagick->addImage( new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png')); 

// Currently Cursor is at 1
// Set the Index to 0
$imagick->setIteratorIndex(0);

// getImageBlob should show last added image but
// cursor is set to 0 thus it shows first image
header("Content-Type: image/png");
echo $imagick->getImageBlob();
?>

<?php 

// Create a new imagick object 
$imagick = new Imagick( 
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png'); 
  
// Add two more images in the same imagick object 
$imagick->addImage( new Imagick( 
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png')); 
  
$imagick->addImage( new Imagick( 
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png')); 

// Currently Cursor is at 2
// Set the Index to 1
$imagick->setIteratorIndex(1);

// Get the Index 
$index = $imagick->getIteratorIndex(); 
echo $index; 
?>