class Excel
{
    public $worksheets = array();
    public function __construct($sWorksheetTitle)
    {
        $this->addsheet($sWorksheetTitle);
    }

    public function addsheet($title)
    {
        $title = preg_replace ("/[\\\¦:¦\/¦\?¦\*¦\[¦\]]/", "", $title);
        $this->worksheets[$title] = substr ($title, 0, 31);
    }

    public function generate ($filename='excel-export')
    {
        $filename = preg_replace('/[^aA-zZ0-9\_\-]/', '', $filename);
        header("Content-Type: application/vnd.ms-excel; charset=UTF-8");
        header("Content-Disposition: inline; filename=\"" . $filename . ".xls\"");
        echo stripslashes("\n");
        foreach ($this->worksheets as $worksheet)
        {
            echo " . $worksheet . "\">";
            echo"\n1\n";
            echo"2\n";
            echo"3\n\n";
            echo"";
        }
        echo "";
    }
}

$xls = new Excel('Sheet');   //构造函数，参数为第一个sheet名称
$xls->addsheet('Test');      //新建一个sheet，参数为sheet名称
$xls->generate('my-test');   //下载excel，参数为文件名