Are there any specific PHP libraries or functions that are recommended for adding watermarks and timestamps to images?

Adding watermarks and timestamps to images in PHP can be achieved using the GD library, which provides functions for image manipulation. To add a watermark, you can overlay a transparent image on top of the original image. To add a timestamp, you can use the `imagestring()` function to draw text on the image. 

// Load the original image
$originalImage = imagecreatefromjpeg('original.jpg');

// Load the watermark image
$watermark = imagecreatefrompng('watermark.png');

// Set the position for the watermark
$watermarkX = 10;
$watermarkY = 10;

// Overlay the watermark on the original image
imagecopy($originalImage, $watermark, $watermarkX, $watermarkY, 0, 0, imagesx($watermark), imagesy($watermark));

// Add a timestamp to the image
$timestamp = date('Y-m-d H:i:s');
$timestampColor = imagecolorallocate($originalImage, 255, 255, 255);
imagestring($originalImage, 5, 10, 30, $timestamp, $timestampColor);

// Output the modified image
header('Content-Type: image/jpeg');
imagejpeg($originalImage);

// Clean up
imagedestroy($originalImage);
imagedestroy($watermark);

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