What are the best practices for distinguishing between old and new images for watermarking in PHP?

When watermarking images in PHP, it is important to distinguish between old and new images to ensure that the watermark is only applied to new images. One way to do this is by checking the creation date of the image file. This can be done by using the filemtime() function in PHP to get the file's last modification time and comparing it to a specific date threshold. 

// Get the last modification time of the image file
$image_path = 'path/to/image.jpg';
$last_modified = filemtime($image_path);

// Set a threshold date for distinguishing between old and new images
$threshold_date = strtotime('2022-01-01');

// Check if the image is considered new based on the threshold date
if ($last_modified >= $threshold_date) {
    // Apply watermark to new image
    // Your watermarking code here
} else {
    // Skip watermarking for old image
}

Keywords

image processing watermarking PHP image comparison metadata

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