What potential pitfalls should be avoided when writing PHP scripts to add watermarks and timestamps to images?

One potential pitfall to avoid when writing PHP scripts to add watermarks and timestamps to images is not properly handling file permissions. Make sure that the script has the necessary permissions to read the original image, write the watermarked image, and save the timestamped image. Additionally, ensure that the script is not vulnerable to injection attacks by properly sanitizing user input. 

// Example PHP code snippet to add watermarks and timestamps to images

// Set file paths
$original_image = 'path/to/original/image.jpg';
$watermark_image = 'path/to/watermark.png';
$timestamp_format = 'Y-m-d H:i:s';
$timestamp_font = 'path/to/font.ttf';

// Create image resources
$original = imagecreatefromjpeg($original_image);
$watermark = imagecreatefrompng($watermark_image);

// Add watermark
imagecopy($original, $watermark, 10, 10, 0, 0, imagesx($watermark), imagesy($watermark));

// Add timestamp
$timestamp = date($timestamp_format);
imagettftext($original, 12, 0, 10, 20, imagecolorallocate($original, 255, 255, 255), $timestamp_font, $timestamp);

// Save watermarked and timestamped image
imagejpeg($original, 'path/to/output/image.jpg');

// Free up memory
imagedestroy($original);
imagedestroy($watermark);

Keywords

image processing watermarking timestamping GD library file permissions

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