備註：基於第三方類庫phpoffice/phpexcel

github:https://github.com/PHPOffice/PHPExcel/

前端：excel.html

<form method="post" action="excel.php" enctype="multipart/form-data">
    <input type="file" name="file" value="">
    <input type="submit" name="submit" value="提交">
</form>

excel.php:

**接受上傳的檔案，直接獲取儲存在伺服器上的臨時檔案

public function importExcel()
{
    //接收前臺檔案
    $ex = $_FILES['file'];
    //重設定檔名
    $filename = time().substr($ex['name'], stripos($ex['name'], '.'));
    $path = ROOT_PATH . 'public/excel/'.$filename; //設定移動路徑
    @move_uploaded_file($ex['tmp_name'],$path);
    //呼叫閱讀excel函式方法 返回陣列
    $exfn = $this->_readExcel($path);
}

**讀取excel 資料

public function _readExcel($path)
{
    //引用PHPexcel 類
    include_once(ROOT_PATH .'vendor/phpoffice/phpexcel/Classes/PHPExcel.php');
    include_once(ROOT_PATH  .'vendor/phpoffice/phpexcel/Classes/PHPExcel/IOFactory.php');//靜態類
    $type = 'Excel2007';//設定為Excel5代表支援2003或以下版本，Excel2007代表2007版
    $xlsReader = \PHPExcel_IOFactory::createReader($type);
    $xlsReader->setReadDataOnly(true);
    $xlsReader->setLoadSheetsOnly(true);
    $Sheets = $xlsReader->load($path);
    //開始讀取上傳到伺服器中的Excel檔案，返回一個二維陣列
    $dataArray = $Sheets->getSheet(0)->toArray();
    return $dataArray;
}

**資料匯出

public function exportExcel()
{
    //需要匯出的資料
    $data = [
        [
            'id' => 1,
            'username' => '111',
            'password' => '14522',
            'email' => '[email protected]',
            'head_ico' => 'fdsafasf',

        ]
    ];
    $name = 'Excel';//匯出的檔名稱
    //引入關鍵類
    include_once(ROOT_PATH .'vendor/phpoffice/phpexcel/Classes/PHPExcel.php');
    error_reporting(E_ALL);
    $objPHPExcel = new \PHPExcel();
    /*以下是一些設定 可忽略*/
    $objPHPExcel->getProperties()->setCreator("明")
        ->setLastModifiedBy("明")
        ->setTitle("EXCEL匯出")
        ->setSubject("EXCEL匯出")
        ->setDescription("資料")
        ->setKeywords("excel")
        ->setCategory("result");
    /*以下就是對處理Excel裡的資料， 橫著取資料，主要是這一步，其他基本都不要改*/
    foreach ($data as $k => $v) {
        $num = $k + 1;
        $objPHPExcel->setActiveSheetIndex(0)//Excel的第A列，uid是你查出陣列的鍵值，下面以此類推
            ->setCellValue('A' . $num, $v['id'])
            ->setCellValue('B' . $num, $v['username'])
            ->setCellValue('C' . $num, $v['password'])
            ->setCellValue('D' . $num, $v['email'])
            ->setCellValue('E' . $num, $v['head_ico']);
    }
    $objPHPExcel->getActiveSheet()->setTitle('User');
    $objPHPExcel->setActiveSheetIndex(0);
    header('Content-Type: applicationnd.ms-excel');
    header('Content-Disposition: attachment;filename="' . $name . '.xls"');
    header('Cache-Control: max-age=0');
    $objWriter = \PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
    $objWriter->save('php://output');
    exit;
}