How can PHP developers effectively manage memory usage and resource cleanup when working with image functions like imagecreatefrompng() and imagepng()?

When working with image functions like imagecreatefrompng() and imagepng(), PHP developers can effectively manage memory usage and resource cleanup by ensuring they properly free up memory after processing images. This can be done by using functions like imagedestroy() to release memory allocated for images once they are no longer needed.

// Example code snippet demonstrating proper memory management when working with image functions

// Load a PNG image
$image = imagecreatefrompng('example.png');

// Process the image here

// Save the processed image as a PNG file
imagepng($image, 'processed_image.png');

// Free up memory allocated for the image
imagedestroy($image);