php读取csv乱码问题解决方法

<form action="erxian_cy.php" method="post" enctype="multipart/form-data">
      <table class="table_con" >
        
        <tbody>
                <tr >
                  <td><input type="file" name="file1"  />
              <input name="t" type="hidden" value="11"></td>
            </tr>
            <tr>
              <td colspan="3" align="center" ><input type="submit" value=" 提 交 " class="submit" /></td>
            </tr>
        
      </table>
      </form>

if($_POST){
 $file1 = $_FILES["file1"];
        $csv_file = fopen($file1["tmp_name"], 'r');
        while(!feof($csv_file))$csv_result[] = fgetcsv_reg($csv_file);
        print_r($csv_result);
        foreach($result as $k=>$item){

        }
}

function fgetcsv_reg(&$handle, $length = null, $d = ',', $e = '"') {
        $d = preg_quote($d);
        $e = preg_quote($e);
        $_line = "";
        $eof=false;
        while ($eof != true) {
        $_line .= (empty ($length) ? fgets($handle) : fgets($handle, $length));
        $itemcnt = preg_match_all('/' . $e . '/', $_line, $dummy);
        if ($itemcnt % 2 == 0)
        $eof = true;
        }
        $_csv_line = preg_replace('/(?: |[ ])?$/', $d, trim($_line));
        $_csv_pattern = '/(' . $e . '[^' . $e . ']*(?:' . $e . $e . '[^' . $e . ']*)*' . $e . '|[^' . $d . ']*)' . $d . '/';
        preg_match_all($_csv_pattern, $_csv_line, $_csv_matches);
        $_csv_data = $_csv_matches[1];
        for ($_csv_i = 0; $_csv_i < count($_csv_data); $_csv_i++) {
        $_csv_data[$_csv_i] = preg_replace('/^' . $e . '(.*)' . $e . '$/s', '$1', $_csv_data[$_csv_i]);
        $_csv_data[$_csv_i] = str_replace($e . $e, $e, $_csv_data[$_csv_i]);
        }
        return empty ($_line) ? false : $_csv_data;
}

fgetcsv_reg 替代 fgetcsv 防止php读取csv出现乱码

只有 type="file" 没有其他任何东西,$_POST为空