ThinkPHP中，运用PHPExcel，将数据库导出到Excel中

1.将PHPExcel插件放在项目中，本人位置是ThinkPHP文件夹下，目录结构如下/ThinkPHP/Library//Vendor/...
2.直接根据模型，配置三个变量即可使用。
/**
 * Excel导出
 * @param $fileName（文件名）
 * @param $headArr （表头）
 * @param $data    （每一行的数据）
 * @throws \PHPExcel_Exception
 * @throws \PHPExcel_Reader_Exception
 */
function getExcel($fileName, $headArr, $data)
{
    include_once(THINK_PATH . "Library/Vendor/phpexcel/PHPExcel.php");
    include_once(THINK_PATH . "Library/Vendor/phpexcel/PHPExcel/Writer/Excel2007.php");
    include_once(THINK_PATH . "Library/Vendor/phpexcel/PHPExcel/Writer/Excel5.php");
    include_once(THINK_PATH . "Library/Vendor/phpexcel/PHPExcel/IOFactory.php");
    if (empty($data) || !is_array($data)) {
        die("data must be a array");
    }
    if (empty($fileName)) {
        exit;
    }
    $date = date("Y_m_d", time());
    $fileName .= "_{$date}.xlsx";

    //创建新的PHPExcel对象
    $objPHPExcel = new \PHPExcel();
    $objProps = $objPHPExcel->getProperties();

    //设置表头
    $key = ord("A");
    $key2 = ord("A");
    $colum2 = '';
    $objActSheet = $objPHPExcel->getActiveSheet();
    $objPHPExcel->getActiveSheet()->getColumnDimension('A')->setWidth(15);
    foreach ($headArr as $v) {
        $colum = chr($key);
        $objPHPExcel->setActiveSheetIndex(0)->setCellValue($colum2 . $colum . '1', $v);
        if ($key < 90) {
            $key += 1;
        } else {
            $key = ord("A");
            $colum2 = chr($key2);
            $key2++;
        }
    }
    //exit;
    $column = 2;

    foreach ($data as $key => $rows) { //行写入
        $span = ord("A");
        $span2 = ord("A");
        $j2 = '';
        foreach ($rows as $keyName => $value) {// 列写入
            $j = chr($span);
            //$objActSheet->setCellValue($j.$column, $value);
            //把每个单元格设置成分文本类型
            //dump($j2.$j.$column);
            $objActSheet->setCellValueExplicit($j2 . $j . $column, $value, \PHPExcel_Cell_DataType::TYPE_STRING);

            if ($span < 90) {
                $span += 1;
            } else {
                $span = ord("A");
                $j2 = chr($span2);
                $span2++;
            }
        }
        $column++;
    }
    // exit;
    $fileName = iconv("utf-8", "gb2312", $fileName);
    //重命名表
    $objPHPExcel->getActiveSheet()->setTitle('Simple');
    //设置活动单指数到第一个表,所以Excel打开这是第一个表
    $objPHPExcel->setActiveSheetIndex(0);
    //将输出重定向到一个客户端web浏览器(Excel2007)
    header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
    header("Content-Disposition: attachment; filename=\"$fileName\"");
    header('Cache-Control: max-age=0');
    $objWriter = \PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
    if (!empty($_GET['excel'])) {
        $objWriter->save('php://output'); //文件通过浏览器下载
    } else {
        $objWriter->save($fileName); //脚本方式运行，保存在当前目录
    }
    $objWriter->save('php://output');
    exit;

}