Codeigniter利用PHPExcel导出Excel文件

在php中我们如果要导入excel文件我们会直接使用php输出csv文件或者使用phpexcel直接生成excel文件，下面我再来介绍Codeigniter利用PHPExcel导出Excel文件具体实现方法，有需要学习的朋友可参考参考。

1. 准备工作
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applicationlibraries目录下，目录结构如下：

  -- applicationlibrariesPHPExcel.php

  -- applicationlibrariesPHPExcel (文件夹)

2）修改applicationlibrariesPHPExcelIOFactory.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）

<?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)
    {
        $query = $this -> db -> get($table_name);

        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); 
        // 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'); 
        // Sending headers to force the user to download the file
        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');
    } 
}

方法二

Excel Plugin 
The following plugin will generate a tab-delimited file, and feed it to the client as an Excel file.

$this->load->plugin('to_excel');
$this->db->use_table('tablename');
$this->db->select('field1', 'field2');
// run joins, order by, where, or anything else here
$query = $this->db->get();
to_excel($query, ['filename']); // filename is optional, without it, the plugin will default to 'exceloutput'

So you could run:

to_excel($query, 'myfile'); // outputs myfile.xls
to_excel($query); // outputs exceloutput.xls
// you could also use a model here
to_excel($this->model_name->functioncall());

/system/plugins/to_excel_pi.php

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
 * Excel library for Code Igniter applications
 * Author: Derek Allard, Dark Horse Consulting, www.darkhorse.to, April 2006
 */
function to_excel($query, $filename = 'exceloutput')
{
    $headers = ''; // just creating the var for field headers to append to below
    $data = ''; // just creating the var for field data to append to below
    $obj = &get_instance();


    $fields = $query -> field_data();
    if ($query -> num_rows() == 0)
    {
        echo '<p>The table appears to have no data.</p>';
    } 
    else
    {
        foreach ($fields as $field)
        {
            $headers .= $field -> name . "t";
        } 
        foreach ($query -> result() as $row)
        {
            $line = '';
            foreach($row as $value)
            {
                if ((!isset($value)) OR ($value == ""))
                {
                    $value = "t";
                } 
                else
                {
                    $value = str_replace('"', '""', $value);
                    $value = '"' . $value . '"' . "t";
                } 
                $line .= $value;
            } 
            $data .= trim($line) . "n";
        } 


        $data = str_replace("r", "", $data);


        header("Content-type: application/x-msdownload");
        header("Content-Disposition: attachment; filename=$filename.xls");
        echo "$headersn$data";
    } 
} 
?>