What are the best practices for storing thumbnails in PHP, considering performance?

When storing thumbnails in PHP, it is important to consider performance to ensure efficient processing and retrieval of images. One best practice is to save thumbnails as separate files rather than generating them on the fly every time they are requested. This can help reduce server load and improve response times for users accessing the thumbnails.

// Example of saving a thumbnail image as a separate file
$originalImagePath = 'path/to/original/image.jpg';
$thumbnailPath = 'path/to/thumbnail/image.jpg';

// Load the original image
$originalImage = imagecreatefromjpeg($originalImagePath);

// Create a thumbnail image with desired dimensions
$thumbnailWidth = 100;
$thumbnailHeight = 100;
$thumbnailImage = imagecreatetruecolor($thumbnailWidth, $thumbnailHeight);
imagecopyresampled($thumbnailImage, $originalImage, 0, 0, 0, 0, $thumbnailWidth, $thumbnailHeight, imagesx($originalImage), imagesy($originalImage));

// Save the thumbnail image to a separate file
imagejpeg($thumbnailImage, $thumbnailPath);

// Free up memory
imagedestroy($originalImage);
imagedestroy($thumbnailImage);