Generate Folder Name based on ID or Number in PHP

PHP Function to generate folder name based on id or a number. Use the following function to create folder name as desired based on your needs.

function generateFolderName($no) {
    $id = ceil(($no/1000))-1;    //Here "1000" defines the folder change after 1000 files
    $folder = "";
    while($id >= 0) {
        $folder = chr($id % 26 + 65) . $folder;
        $id = floor($id / 26) - 1;
    }
    return strtolower($folder);
}

This makes folder name change after 1000 files. Hence 1-1000 will return "a" and 1001-2000 will return "b" and hence like that.