What is the best approach to dynamically create images using PHP's Image functions?

When dynamically creating images using PHP's Image functions, the best approach is to start by creating a blank canvas using the `imagecreatetruecolor()` function. Then, you can manipulate the image by adding shapes, text, colors, etc. Finally, you can output the image using the appropriate `imageXXX()` function (e.g., `imagepng()` for PNG format).

<?php
// Create a blank canvas
$image = imagecreatetruecolor(200, 200);

// Add a background color
$bgColor = imagecolorallocate($image, 255, 255, 255);
imagefill($image, 0, 0, $bgColor);

// Add text
$textColor = imagecolorallocate($image, 0, 0, 0);
imagestring($image, 5, 50, 50, 'Hello World', $textColor);

// Output the image
header('Content-Type: image/png');
imagepng($image);

// Free up memory
imagedestroy($image);
?>