PHP Array to CSV in UTF-8 read by MS Excel

To people who are looking for a PHP script that can convert an array (mostly multi-dimensional array) to CSV in UTF-8, here is the code and file for you to download:

PHP Array To CSV Read By MS Excel in UTF-8

Credit to Jérôme Jaglale, what I am looking for is a CodeIgniter solution to convert array to CSV, but it can also be used in non-CI PHP application. This is not a class, just a function (Helper). The full code below:

if(!function_exists('array_to_csv')){
 function array_to_csv($array, $download = ""){
  // http://stackoverflow.com/questions/13108157/php-array-to-csv
  if(empty($download)){
   $res = array();
   foreach($array as $arr) {
       $res[] = implode(',', $arr);
   }
   return $res;
  }else{
   $output = fopen("php://output",'w') or die("Can't open php://output");
   // http://stackoverflow.com/questions/4348802/how-can-i-output-a-utf-8-csv-in-php-that-excel-will-read-properly
   header('Content-Encoding: UTF-8');
   header("Content-Type:application/csv");
   header("Content-Disposition:attachment;filename=".$download);
   echo "\xEF\xBB\xBF";
   foreach($array as $arr) {
    array_map('iconv_utf8_big5', $arr);
       fputcsv($output, $arr);
   }
   fclose($output) or die("Can't close php://output");
  }
 }

 function iconv_utf8_big5($str){
  return @iconv(mb_detect_encoding($str, mb_detect_order(), true), "UTF-8", $str);
 }
}

Hope it helps someone.