CI中使用PHPExcel导出数据到Excel

<?php
class Table_export extends CI_Controller {

function __construct()
{
parent::__construct();

// Here you should add some sort of user validation
// to prevent strangers from pulling your table data
}

function index($table_name)
{
$this->load->database();
$query = $this->db->query("select * from `$table_name` WHERE del= 1");
// $query = mb_convert_encoding("gb2312", "UTF-8", $query);
if(!$query)
return false;

// Starting the PHPExcel library
$this->load->library('PHPExcel');
$this->load->library('PHPExcel/IOFactory');

$objPHPExcel = new PHPExcel();
$objPHPExcel->getProperties()->setTitle("export")->setDescription("none");

$objPHPExcel->setActiveSheetIndex(0)
->setCellValue('A1', iconv('gbk', 'utf-8', '中文Hello'))
->setCellValue('B2', 'world!')
->setCellValue('C1', 'Hello');
// Field names in the first row
$fields = $query->list_fields();
$col = 0;
foreach ($fields as $field)
{
$objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, 1, $field);
$col++;
}

// Fetching the table data
$row = 2;
foreach($query->result() as $data)
{
$col = 0;
foreach ($fields as $field)
{
$objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, $row, $data->$field);
$col++;
}

$row++;
}

$objPHPExcel->setActiveSheetIndex(0);

$objWriter = IOFactory::createWriter($objPHPExcel, 'Excel5');

//发送标题强制用户下载文件
header('Content-Type: application/vnd.ms-excel');
header('Content-Disposition: attachment;filename="Products_'.date('dMy').'.xls"');
header('Cache-Control: max-age=0');

$objWriter->save('php://output');
}
}
?>