What are some best practices for comparing file names stored in a database with files in an upload directory using PHP?

When comparing file names stored in a database with files in an upload directory using PHP, it is important to ensure that the comparison is case-insensitive to account for any variations in file naming conventions. One approach is to retrieve the list of file names from the database and the upload directory, convert them to lowercase, and then compare them to find any matches.

// Retrieve file names from the database
$databaseFiles = array_map('strtolower', $databaseFileNames);

// Get list of files in the upload directory
$uploadDirectory = 'uploads/';
$uploadFiles = array_map('strtolower', scandir($uploadDirectory));

// Compare file names
$matchingFiles = array_intersect($databaseFiles, $uploadFiles);

// Output matching files
foreach ($matchingFiles as $file) {
    echo "Matching file found: $file <br>";
}