在PHP导出Excel时，如何设置列宽以确保支付宝账号、姓名和打款金额分别占据A、B、C列？

set_time_limit(0);
ob_end_clean();
header("content-type: application/vnd.ms-excel");
header('content-disposition: attachment; filename="文章信息统计'.date('ymdhis').'.xls"');
$fp = fopen('php://output', 'w');
fwrite($fp, chr(0xef).chr(0xbb).chr(0xbf));
$title = array('支付宝账号','姓名','打款金额');
fputcsv($fp, $title, "\t");
$body = array();
foreach($list as $key=>$val){
    $body['alipay_acount'] = $val['alipay_acount'];
    $body['alipay_real_name'] = $val['alipay_real_name'];
    $body['money'] = $val['total_check_che'];
    fputcsv($fp, $body, "\t");
}
fclose($fp);

require_once 'Classes/PHPExcel.php'; //  引入PHPExcel库

$objPHPExcel = new PHPExcel();
$sheet = $objPHPExcel->getActiveSheet();

// 设置表头
$sheet->setCellValue('A1', '支付宝账号');
$sheet->setCellValue('B1', '姓名');
$sheet->setCellValue('C1', '打款金额');

// 设置数据
$row = 2;
foreach ($list as $val) {
    $sheet->setCellValue('A' . $row, $val['alipay_acount']);
    $sheet->setCellValue('B' . $row, $val['alipay_real_name']);
    $sheet->setCellValue('C' . $row, $val['total_check_che']);
    $row++;
}

// 设置列宽
$sheet->getColumnDimension('A')->setWidth(20); // 支付宝账号列宽
$sheet->getColumnDimension('B')->setWidth(15); // 姓名列宽
$sheet->getColumnDimension('C')->setWidth(10); // 打款金额列宽


// 保存Excel文件
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5'); //  Excel5 for .xls
$objWriter->save('文章信息统计'.date('ymdhis').'.xls');