Du skulle prøve utf8_decode(), den virker fremragende, nogle gange lidt for godt, men så brug denne:

function decodeuft8($str){
$matches = array(”¡”,”¢”,”£”,”¤”,”Â¥”,”¦”,”§”,”¨”,”©”,”ª”,”«”,”¬”,”­”,”®”,”¯”,”°”,”±”,”²”,”³”,”´”,”µ”,”?”,”¶”,”•”,”¸”,”¹”,”º”,”»”,”¼”,”½”,”¾”,”¿”,”À”,”Ã?”,””,”Ô,”Ä”,”Ã…”,”Æ”,”Ç”,”È”,”É”,”Ê”,”Ë”,”ÃŒ”,”Ã?”,”ÃŽ”,”Ã?”,”Ã?”,”Ñ”,”Ã’”,”Ó”,”Ô”,”Õ”,”Ö”,”×”,”Ø”,”Ù”,”Ú”,”Û”,”Ãœ”,”Ã?”,”Þ”,”ß”,”à “,”À”,”á”,”Ã?”,”â”,””,”ã”,”Ô,”ä”,”Ä”,”Ã¥”,”Ã…”,”æ”,”Æ”,”ç”,”Ç”,”è”,”È”,”é”,”É”,”ê”,”Ê”,”ë”,”Ë”,”ì”,”ÃŒ”,”í”,”Ã?”,”î”,”ÃŽ”,”ï”,”Ã?”,”ð”,”Ã?”,”ñ”,”Ñ”,”ò”,”Ã’”,”ó”,”Ó”,”ô”,”Ô”,”õ”,”Õ”,”ö”,”Ö”,”÷”,”ø”,”Ø”,”ù”,”Ù”,”ú”,”Ú”,”û”,”Û”,”ü”,”Ãœ”,”ý”,”Ã?”,”þ”,”Þ”,”ÿ”,”?”,”ÂŒ”,”Âœ”,”Š”,”š”,”Ÿ”,”ÂŽ”,”ž”,”ƒ”,”ˆ”,”˜”);
$replaces = array(”¡”,”¢”,”£”,”¤”,”¥”,”¦”,”§”,”¨”,”©”,”ª”,”«”,”¬”,”­”,”®”,”¯”,”°”,”±”,”²”,”³”,”´”,”µ”,”?”,”¶”,”•”,”¸”,”¹”,”º”,”»”,”¼”,”½”,”¾”,”¿”,”À”,”Á”,””,”Ô,”Ä”,”Å”,”Æ”,”Ç”,”È”,”É”,”Ê”,”Ë”,”Ì”,”Í”,”Δ,”Ï”,”Д,”Ñ”,”Ò”,”Ó”,”Ô”,”Õ”,”Ö”,”×”,”Ø”,”Ù”,”Ú”,”Û”,”Ü”,”Ý”,”Þ”,”ß”,”à”,”À”,”á”,”Á”,”â”,””,”ã”,”Ô,”ä”,”Ä”,”å”,”Å”,”æ”,”Æ”,”ç”,”Ç”,”è”,”È”,”é”,”É”,”ê”,”Ê”,”ë”,”Ë”,”ì”,”Ì”,”í”,”Í”,”î”,”Δ,”ï”,”Ï”,”ð”,”Д,”ñ”,”Ñ”,”ò”,”Ò”,”ó”,”Ó”,”ô”,”Ô”,”õ”,”Õ”,”ö”,”Ö”,”÷”,”ø”,”Ø”,”ù”,”Ù”,”ú”,”Ú”,”û”,”Û”,”ü”,”Ü”,”ý”,”Ý”,”þ”,”Þ”,”ÿ”,”?”,”Œ”,”œ”,”Š”,”š”,”Ÿ”,”Ž”,”ž”,”ƒ”,”ˆ”,”˜”);
return str_replace($matches, $replaces, $str);
}