How can PHP be used to compare the contents of an original gallery folder with its thumbnail folder to ensure they stay in sync?

To compare the contents of an original gallery folder with its thumbnail folder, we can use PHP to iterate through the files in both directories and compare their names. If a file exists in the original gallery folder but not in the thumbnail folder, we can create a corresponding thumbnail. If a file exists in the thumbnail folder but not in the original gallery folder, we can remove the thumbnail. 

$original_folder = 'path/to/original/gallery/';
$thumbnail_folder = 'path/to/thumbnail/gallery/';

$original_files = scandir($original_folder);
$thumbnail_files = scandir($thumbnail_folder);

foreach ($original_files as $file) {
    if ($file != '.' && $file != '..') {
        if (!in_array($file, $thumbnail_files)) {
            // Create thumbnail for $file
            // Example: copy($original_folder . $file, $thumbnail_folder . $file);
        }
    }
}

foreach ($thumbnail_files as $file) {
    if ($file != '.' && $file != '..') {
        if (!in_array($file, $original_files)) {
            // Remove thumbnail for $file
            // Example: unlink($thumbnail_folder . $file);
        }
    }
}

Keywords

PHP file comparison folder synchronization image processing file manipulation

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