PHP导出CSV（工具方法）

    /**
     * 导出CSV文件
     * @param array $data 数据
     * @param array $header_data 首行数据
     * @param string $file_name 文件名称
     * @return string
     */
    function export_csv_1($tittle = [], $data = [], $file_name = '')
    {
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename=' . $file_name);
        if (!empty($tittle)) {
            $tempStr = "";
            foreach ($tittle as $item)
                $tempStr .= strip_tags(str_replace(",","",$item)) . ",";
            $tempStr = iconv("utf-8", "gb2312", substr($tempStr, 0, strlen($tempStr) - 1));;//去除结尾“，”
            echo $tempStr . PHP_EOL;
        }

        foreach ($data as $dataRow) {
            $tempStr = "";
            foreach ($dataRow as $item)
                $tempStr .= strip_tags(str_replace(",","",$item)) . ",";

            $tempStr = iconv("utf-8", "gb2312", substr($tempStr, 0, strlen($tempStr) - 1));;//去除结尾“，”
            echo $tempStr . PHP_EOL;
        }
    }