1. 准備工作
下載PHPExcel：http://phpexcel.codeplex.com
這是個強大的Excel庫，這里只演示導出Excel文件的功能，其中的大部分功能可能都用不着。
2. 安裝PHPExcel到Codeigniter
1） 解壓壓縮包里的Classes文件夾中的內容到application\libraries\目錄下，目錄結構如下：
-- application\libraries\PHPExcel.php
-- application\libraries\PHPExcel (文件夾)
2）修改application\libraries\PHPExcel\IOFactory.php 文件
-- 將其類名從PHPExcel_IOFactory改為IOFactory，遵從CI類命名規則。
-- 將其構造函數改為public
3. 安裝完畢，寫一個導出excel的控制器（Controller）
代碼如下：
1 <?php
2
3 class Table_export extends CI_Controller {
4
5 function __construct()
6 {
7 parent::__construct();
8
9 // Here you should add some sort of user validation
10 // to prevent strangers from pulling your table data
11 }
12
13 function index($table_name)
14 {
15 $query = $this->db->get($table_name);
16
17 if(!$query)
18 return false;
19
20 // Starting the PHPExcel library
21 $this->load->library('PHPExcel');
22 $this->load->library('PHPExcel/IOFactory');
23
24 $objPHPExcel = new PHPExcel();
25 $objPHPExcel->getProperties()->setTitle("export")->setDescription("none");
26
27 $objPHPExcel->setActiveSheetIndex(0);
28
29 // Field names in the first row
30 $fields = $query->list_fields();
31 $col = 0;
32 foreach ($fields as $field)
33 {
34 $objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, 1, $field);
35 $col++;
36 }
37
38 // Fetching the table data
39 $row = 2;
40 foreach($query->result() as $data)
41 {
42 $col = 0;
43 foreach ($fields as $field)
44 {
45 $objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, $row, $data->$field);
46 $col++;
47 }
48
49 $row++;
50 }
51
52 $objPHPExcel->setActiveSheetIndex(0);
53
54 $objWriter = IOFactory::createWriter($objPHPExcel, 'Excel5');
55
56 // Sending headers to force the user to download the file
57 header('Content-Type: application/vnd.ms-excel');
58 header('Content-Disposition: attachment;filename="Products_'.date('dMy').'.xls"');
59 header('Cache-Control: max-age=0');
60
61 $objWriter->save('php://output');
62 }
63
64 }
4. 測試
加入數據庫有表名為products，此時可以訪問http://www.yoursite.com/table_export/index/products 導出Excel文件了。
參考：http://www.dannyherran.com/2011/03/exporting-your-mysql-table-data-with-phpexcel-codeigniter/