PHPExcel是个非常强大得Excel操作类，GIT地址：https://github.com/PHPOffice/PHPExcel/，需要注意得是这个项目已经停止维护了。

替代项目PhpSpreadsheet：https://github.com/PHPOffice/PhpSpreadsheet

下面这段代码展示了如何将processWire的数据全部导出至Excel中：

$pages_export = new PageArray();	//需要导出的数据集
$pages_export->import($page);

/** Error reporting */
error_reporting(E_ALL);
ini_set('display_errors', TRUE);
ini_set('display_startup_errors', TRUE);
date_default_timezone_set('Europe/London');

if (PHP_SAPI == 'cli')
	die('This example should only be run from a Web Browser');

/** Include PHPExcel */
require_once dirname(__FILE__) . './classes/phpexcel/PHPExcel.php';
// Create new PHPExcel object
$objPHPExcel = new PHPExcel();

// Set document properties
$objPHPExcel->getProperties()->setCreator("Julian Wong")
							 ->setLastModifiedBy("Julian Wong")
							 ->setTitle("BMS Export XLSX Document")
							 ->setSubject("BMS Export XLSX Document")
							 ->setDescription("export page data to xlsx document for Office 2007 XLSX, generated using PHP classes.")
							 ->setKeywords("office 2007 openxml php")
							 ->setCategory("result file");


        $objPHPExcel->setActiveSheetIndex(0);
        // Field names in the first row
        $fields = $page->template->fields;
        $col = 0;
        foreach($fields as $f){
            $objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, 1, $f->label);
            $col++;
        }

        //Fetching the table data
        $row = 2;
        foreach($pages_export as $p)
        {
            $col = 0;
            foreach ($fields as $f)
            {
                $fname = $f->name;
                if($f->type == "FieldtypeOptions"){//特殊字段的处理
                    $data = array();
                    foreach ($p->$fname as $item) {
                        $data[] = $item->title;
                    }
                    $fval = implode($data, "、");    
                }else{    //默认文本字段
                    $fval = $p->$fname;        
                }

                $objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, $row, $fval);
                $col++;
            }
 
            $row++;
        }      
        
// Rename worksheet
$objPHPExcel->getActiveSheet()->setTitle('企业信息');

// Set active sheet index to the first sheet, so Excel opens this as the first sheet
$objPHPExcel->setActiveSheetIndex(0);

// Redirect output to a client’s web browser (Excel5)
header('Content-Type: application/vnd.ms-excel');
header('Content-Disposition: attachment;filename="01simple.xls"');
header('Cache-Control: max-age=0');
// If you're serving to IE 9, then the following may be needed
header('Cache-Control: max-age=1');

// If you're serving to IE over SSL, then the following may be needed
header ('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past
header ('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT'); // always modified
header ('Cache-Control: cache, must-revalidate'); // HTTP/1.1
header ('Pragma: public'); // HTTP/1.0

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$objWriter->save('php://output');
exit;