php 导出csv文件方法

public static function exportCsv($data, $titleArr, $fileName = '') {
        $csv_data = '';
    /** 标题 */
    $nums = count($titleArr);
    for ($i = 0; $i < $nums - 1; ++$i) {
        $title = '"' . $titleArr[$i] . '",';
        $csv_data .= iconv('UTF-8', 'GBK', $title);
    }

    if ($nums > 0) {
        $title1 = '"' . $titleArr[$nums - 1] . "\"\r\n";
        $csv_data .= iconv('UTF-8', 'GBK', $title1);;
    }

    foreach ($data as $k => $row) {
        for ($i = 0; $i < $nums - 1; ++$i) {
            $row[$i] = iconv('UTF-8', 'GBK', $row[$i]);
            $row[$i] = str_replace("\"", "\"\"", $row[$i]);
            $csv_data .= '"' . $row[$i] . '",';
        }
        $csv_data .=  iconv('UTF-8', 'GBK',  '"' . $row[$nums - 1] . "\"\r\n");;
        unset($data[$k]);
    }

    header('Content-Type: text/csv; charset=UTF-8');

    //取数组最后一个元素，得到文件类型
    $uploaddir =  public_path() .'upload/phpExcel/syncFile/';//设置文件保存目录注意包含
    if (!file_exists($uploaddir)) {
        mkdir($uploaddir, 0700, true);
    }

    $path = $uploaddir. $fileName;

    $file_name = empty($path) ? date('Y-m-d-H-i-s', time()) : $path;
    file_put_contents($file_name, $csv_data);

    return $file_name;</code></pre>