php 导入csv乱码问题怎么办

function tb_str_getcsv($string, $delimiter=',', $enclosure='"') {
$fp = fopen('php://temp/', 'r+');
fputs($fp, $string);
rewind($fp);
while($t = fgetcsv($fp, strlen($string), $delimiter, $enclosure)) {
$r[] = $t;
}
if(count($r) ==1) return current($r);
return $r;
}
$s = file_get_contents($path); //读取文件到变量
$s = iconv('UTF-16LE', 'utf-8', substr($s,2));//转码，substr($s,2)的作用是去掉 BOM 头 FFFE
//有的第三方数据包很不规范，控制符没有用空双引号
//可能导致列数不对应，在此加上空双引号
$s = str_replace("\t\t", "\t\"\"\t", $s);
$s = str_replace("\t\t", "\t\"\"\t", $s);
$csv_data = tb_str_getcsv($s, "\t");//读取到数组