Description:
------------
scandir Have Problem with UTF8 Character

Please check this image:
http://i.imgur.com/3K2Y9YZ.jpg

my folders and files name is UTF8 character (Farsi).

i need scan directorys for get list files with ScanDir , but this function have problem with UTF8 name.

Tested Information: (i have linux host in HostUpon)
System: Linux cs11.uhcloud.com 2.6.32-673.8.1.lve1.4.3.el6.x86_64 #1 SMP Wed Feb 10 08:57:30 EST 2016 x86_64 
PHP Version: 7.1.7

Test script:
---------------
$files = scanDirectories('files');
print_r($files);

public static function scanDirectories($rootDir, $allData=array()) {
        $invisibleFileNames = array(".", "..");
        $dirContent = scandir($rootDir);
        foreach($dirContent as $key => $content) {
            $path = $rootDir.'/'.$content;
            if(!in_array($content, $invisibleFileNames)) {
                if(Self::isFile($path)) {
                    $allData[] = $path;
                }elseif(Self::isDir($path)) {
                    $allData = Self::scanDirectories($path, $allData);
                }
            }
        }
        return $allData;
    }

    public static function isDir($path)
    {
        $result = pathinfo($path);
        if (!array_key_exists("extension",$result))
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    public static function isFile($path)
    {
        $result = pathinfo($path);
        if (array_key_exists("extension",$result))
        {
            return true;
        }
        else
        {
            return false;
        }
    }