<?php
    $dir = opendir("/home/fabian/Downloads");
    $count = 0;

    while (($file = readdir($dir)) !== false)
    {
    $filelength = strlen($file);
        for ($filelength<=150;$filelength>$count;$count++){
            echo "<option value='$count'>$file</option>";
        }
    }

    closedir($dir);
?>