Umschreiben von Umlauten in Dateinamen

    private function umlautPatcher($value)
    {
        $value = strtolower ($value);

        $search = array(" ", "ä", "Ä", "ö", "Ö", "ü", "Ü", "ß");
        $replace = array("_", "ae", "ae", "oe", "oe", "ue", "ue", "ss");
        $patched = str_replace($search, $replace, $value);

        return $patched;
    }

    public function ftpImporter()
    {
        $arCleaned = array();

        function fileFilter ( $strEntry )
        {
            if ( substr ( $strEntry, -5 ) == '.jpeg' || substr ( $strEntry, -4 ) == '.png' || substr ( $strEntry, -4 ) == '.gif' || substr ( $strEntry, -4 ) == '.jpg' ) {
                return $strEntry;
            }
            return false;
        }
        $arDir = scandir( './upload/import/' );
        $arFiles = array_filter ( $arDir, 'fileFilter' );

        foreach($arFiles as $files) {
            $arCleaned[] = $this->umlautPatcher($files);
        }

        return $arCleaned;
    }

array(3) {
  [0]=>
  string(46) "ää_öö_üü_ä_ö_ü_hasssssoo.jpg"
  [1]=>
  string(18) "firefoxlogo3.5.png"
  [2]=>
  string(16) "ppuf1000x907.gif"
}

array(3) {
  [0]=>
  string(46) "ÄÄ ÖÖ ÜÜ ä ö ü haßßsoo.jpg"
  [1]=>
  string(18) "FirefoxLogo3.5.png"
  [2]=>
  string(16) "ppuf1000X907.gif"
}

array(3) {
  [0]=>
  string(5) "UTF-8"
  [1]=>
  string(5) "ASCII"
  [2]=>
  string(5) "ASCII"
}

        $search = array(" ", "ä", "Ä", "ö", "Ö", "ü", "Ü", "ß", "A\314\210", "O\314\210", "U\314\210", "a\314\210", "o\314\210", "u\314\210");
        $replace = array("_", "ae", "ae", "oe", "oe", "ue", "ue", "ss", "ae", "oe", "ue", "ae", "oe", "ue");