下载PHPExcel：http://phpexcel.codeplex.com

这是个强大的Excel库，这里只演示导出Excel文件的功能，其中的大部分功能可能都用不着。

2. 安装PHPExcel到Codeigniter

1） 解压压缩包里的Classes文件夹中的内容到application\libraries\目录下，目录结构如下：

– application\libraries\PHPExcel.php

– application\libraries\PHPExcel (文件夹)

2）修改application\libraries\PHPExcel\IOFactory.php 文件

– 将其类名从PHPExcel_IOFactory改为IOFactory，遵从CI类命名规则。

– 将其构造函数改为public

3. 安装完毕，写一个导出excel的控制器（Controller）

代码如下：

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’);
}

}
?>

加入数据库有表名为products，此时可以访问http://www.yoursite.com/table_export/index/products 导出Excel文件了