bulk csv change encoding code example

Example: csv file import encoding error

<?php
# http://www.practicalweb.co.uk/blog/2008/05/18/reading-a-unicode-excel-file-in-php/
function fopen_utf8($filename){
    $encoding='';
    $handle = fopen($filename, 'r');
    $bom = fread($handle, 2);
//  fclose($handle);
    rewind($handle);

    if($bom === chr(0xff).chr(0xfe)  || $bom === chr(0xfe).chr(0xff)){
            // UTF16 Byte Order Mark present
            $encoding = 'UTF-16';
    } else {
        $file_sample = fread($handle, 1000) + 'e'; //read first 1000 bytes
        // + e is a workaround for mb_string bug
        rewind($handle);

        $encoding = mb_detect_encoding($file_sample , 'UTF-8, UTF-7, ASCII, EUC-JP,SJIS, eucJP-win, SJIS-win, JIS, ISO-2022-JP');
    }
    if ($encoding){
        stream_filter_append($handle, 'convert.iconv.'.$encoding.'/UTF-8');
    }
    return  ($handle);
} 
?>