Generate unique name of the new file by full path to the file

gistfile1.aw

<?php
function genUniqueFileName($fullPathToFile)
{
    $pathInfo = pathinfo($fullPathToFile);
    $k = 1;
    $uniquePath = $fullPathToFile;
    while (file_exists($uniquePath)) {
        $uniquePath = $pathInfo['dirname'] . '/' . $pathInfo['filename'] . '-' . $k++ . '.' . $pathInfo['extension'];
    }
    
    $newFileName = pathinfo($uniquePath, PATHINFO_BASENAME);
    return $newFileName;
}