PHP에서 직원 출석 데이터를 백업하고 복원하는 방법은 무엇입니까?

<?php
$host = 'localhost';
$username = 'root';
$password = 'password';
$database = 'attendance_db';
$backupFile = 'attendance_backup.sql';

// 使用系统命令导出数据库
exec("mysqldump -h $host -u $username -p$password $database > $backupFile");

echo "数据库备份成功！";
?>

<?php
$data = array(
    array('员工ID', '考勤日期', '上班时间', '下班时间'),
    array('001', '2021-01-01', '08:30:00', '17:30:00'),
    array('002', '2021-01-01', '09:00:00', '18:00:00'),
);

$csvFile = 'attendance_backup.csv';

// 打开CSV文件并写入数据
$handle = fopen($csvFile, 'w');
foreach ($data as $row) {
    fputcsv($handle, $row);
}
fclose($handle);

echo "数据备份成功！";
?>

<?php
require_once 'PHPExcel/PHPExcel.php';

$excelFile = 'attendance_backup.xls';

// 创建新的PHPExcel对象
$objPHPExcel = new PHPExcel();

// 设置表格标题栏
$objPHPExcel->getActiveSheet()->setCellValue('A1', '员工ID');
$objPHPExcel->getActiveSheet()->setCellValue('B1', '考勤日期');
$objPHPExcel->getActiveSheet()->setCellValue('C1', '上班时间');
$objPHPExcel->getActiveSheet()->setCellValue('D1', '下班时间');

// 填充数据
$objPHPExcel->getActiveSheet()->setCellValue('A2', '001');
$objPHPExcel->getActiveSheet()->setCellValue('B2', '2021-01-01');
$objPHPExcel->getActiveSheet()->setCellValue('C2', '08:30:00');
$objPHPExcel->getActiveSheet()->setCellValue('D2', '17:30:00');

// 保存为Excel文件
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
$objWriter->save($excelFile);

echo "数据备份成功！";
?>

<?php
$csvFile = 'attendance_backup.csv';

// 打开CSV文件并读取数据
$data = array();
if (($handle = fopen($csvFile, 'r')) !== false) {
    while (($row = fgetcsv($handle)) !== false) {
        $data[] = $row;
    }
    fclose($handle);
}

// 将数据写入数据库或其他数据存储系统
foreach ($data as $row) {
    $employeeId = $row[0];
    $attendanceDate = $row[1];
    $startTime = $row[2];
    $endTime = $row[3];

    // 写入数据库或其他数据存储系统的代码
    // ...
}

echo "数据恢复成功！";
?>