Is it possible to fill a list with values from a file on the user's hard drive using PHP?

Yes, it is possible to fill a list with values from a file on the user's hard drive using PHP. You can achieve this by reading the contents of the file into an array using the file() function and then iterating over the array to populate your list.

$file_path = 'path/to/your/file.txt';
$file_contents = file($file_path);

echo '<ul>';
foreach ($file_contents as $line) {
    echo '<li>' . $line . '</li>';
}
echo '</ul>';