What potential issue could arise if the target directory is empty in the provided PHP script?

If the target directory is empty in the provided PHP script, attempting to move or copy files from the source directory to the target directory will result in an error because there are no files to move or copy. To solve this issue, you can check if the target directory is empty before attempting to move or copy files.

// Check if the target directory is empty before moving or copying files
$targetDirectory = 'path/to/target/directory';
if (count(glob($targetDirectory . '/*')) === 0) {
    // Target directory is empty, perform move or copy operation
    // Your move or copy logic here
} else {
    echo 'Target directory is not empty. Please clear it before proceeding.';
}