基于phpExcel写的excel类

<?php
/*
 * 类的功能
 * 传入二位数组导出excel
 * 传入excel 导出二位数组
 * @author mrwu
 */
require('PHPExcel.php');
require_once 'PHPExcel/Reader/Excel5.php';
include 'PHPExcel/IOFactory.php';  

class plugin_phpexcel
{
    private $export_excel_title;//导出excel标题
    private $export_sheet_title;//导出sheet标题
    private $letters;
    private $php_excel;//php_excel操作类
    private $active_sheet;

    function __construct($export_excel_title='excel',$export_sheet_title='sheet1')
    {
    $this->letters=range('A','Z',1);
    $this->php_excel=new PHPExcel();
    $this->php_excel->setActiveSheetIndex(0);
    $this->active_sheet=$this->php_excel->getActiveSheet();
    $this->export_excel_title=$export_excel_title;
    $this->export_sheet_title=$export_sheet_title;
    }

    /*
     * $title='标题' array
     * $import_arr 插入excel的数组 要求二位数组
     */
    function export($title=array(),$import_arr)
    {
    //有设置excel第一行的标题
        if($title)
        {
       $count=count($title);
        for($i=0;$i<=$count;$i++)
             {
                  $this->active_sheet->setCellValue($this->letters[$i].'1',$title[$i]);
             }
        }
     //循环插入二维数组
        $count=count($import_arr[0]);
        $row=1;
        foreach($import_arr as $value)
        {

            $row++;
            $j=0;
            foreach($value as $key=>$v)
            {
            $this->active_sheet->setCellValue($this->letters[$j].$row,$v);
            echo $value[$j];
            $j++;
            }
        }
        $phpWriter=PHPExcel_IOFactory::createWriter($this->php_excel,'Excel5');
        //设置一些标题等
        $file=$this->export_excel_title;
        $this->active_sheet->setTitle($this->export_sheet_title);

        //设置header
        header("Pragma: public");
        header("Expires: 0");
        header("Cache-Control:must-revalidate, post-check=0, pre-check=0");
        header("Content-Type:application/force-download");
        header("Content-Type:application/vnd.ms-execl");
        header("Content-Type:application/octet-stream");
        header("Content-Type:application/download");
        header('Content-Disposition:attachment;filename="excel.xls"');
        header("Content-Transfer-Encoding:binary");  

        $phpWriter->save('php://output'); 

    }
}
    //测试
    $php_excel=new plugin_phpexcel('excel','sheet1');
    $php_excel->export(array('title','content'),array(array('title'=>'haha','content'=>'shit'),array('title'=>'hehe','content'=>'fuck')));