PHP | ImagickPixelIterator __construct() function

<?php
// Create a new imagick object
$imagick = new Imagick();
 
// Create a image on imagick object
$imagick->newImage(800, 250, 'black');

// Create a new imagickPixelIterator object
$imageIterator = new ImagickPixelIterator($imagick);
 
// Loop through pixel rows
foreach ($imageIterator as $row => $pixels) {
 
    foreach ($pixels as $column => $pixel) {
        // Set the color of each pixel to blue
        $pixel->setColor('blue');
    }
 
    // Sync the iterator after each iteration
    $imageIterator->syncIterator();
}

// Show the output
$imagick->setImageFormat('png');
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');

// Create a new imagickPixelIterator object
$imageIterator = new ImagickPixelIterator($imagick);

$i = 0;

// Loop through pixel rows
foreach ($imageIterator as $row => $pixels) {

    foreach ($pixels as $column => $pixel) {
        $i++;
    }

    // Sync the iterator after each iteration
    $imageIterator->syncIterator();
}

echo 'Total number of pixels: ' . $i;
?>