What resources or tutorials would be recommended for someone with advanced PHP knowledge looking to learn about creating dynamic images and generators?

To learn about creating dynamic images and generators in PHP, resources such as the official PHP documentation on image processing functions, tutorials on using libraries like GD or Imagick, and online courses on advanced PHP image manipulation techniques would be recommended.

<?php
// Example code for creating a dynamic image using GD library
$width = 200;
$height = 100;

$image = imagecreatetruecolor($width, $height);

$bg_color = imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 0, 0, 0);

imagefill($image, 0, 0, $bg_color);
imagestring($image, 5, 50, 50, 'Dynamic Image', $text_color);

header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>