下文给各位整理了一篇关于php 读取 和 生成 unicode csv 文件的例子，希望这个例子可以给各位带来帮助的哦．
=======先介绍下bom==============
bytes  encoding form
ef bb bf utf-8
ff fe utf-16 aka ucs-2, little endian
fe ff utf-16 aka ucs-2, big endian
00 00 ff fe utf-32 aka ucs-4, little endian.
00 00 fe ff utf-32 aka ucs-4, big-endian.
=======================
读取 unicode csv 文件
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);
}
生成 unicode csv （此php文件一定要是无bom的utf-8编码文件）
?view code php
$content=iconv(utf-8,utf-16le,$content);
$content = ＼xff＼xfe.$content; //添加bom
header(content-type: text/csv;charset=utf-16le) ;
header(content-disposition: attachment; filename=test.csv);
再介绍一个 操作 ansi 编码 以 , 隔开的 操作类