<?php
$str = "Grüner Veltliner „DoN“ GÖTTWEIGERBERG";
// $str = mb_convert_encoding($str, "Windows-1252", "UTF-8");
// $str = iconv("Windows-1252", "UTF-8", $str);
echo $str;
PD9waHAKCiRzdHIgPSAiR3LDvG5lciBWZWx0bGluZXIg4oCeRG9O4oCcIEfDllRUV0VJR0VSQkVSRyI7Ci8vICRzdHIgPSBtYl9jb252ZXJ0X2VuY29kaW5nKCRzdHIsICJXaW5kb3dzLTEyNTIiLCAiVVRGLTgiKTsKLy8gJHN0ciA9IGljb252KCJXaW5kb3dzLTEyNTIiLCAiVVRGLTgiLCAkc3RyKTsKZWNobyAkc3RyOw==