下载之后清除excel文件以在PHPExcel中重用

Question

我使用PHPExcel创建带有单个工作表的excel文件。

我已设法做到这一点，但问题发生在我创建它之后然后它没有清楚，所以当我再次创建它时，先前的数据与新数据一起出现。

所以我只想清除 excel 文件，然后再次使用。

以下是代码：

require_once APPPATH.'third_party/PHPExcel.php';
require_once APPPATH.'third_party/PHPExcel/IOFactory.php';

//Getting Data form database

$bTob_gstdata = $this->reports_model->get_bTob_gstdata($date_from, $date_to);

//Sample Excel File (which is clear already Just contain the structure)
$filename =  'assets/btob_base_excel.xls';
$objPHPExcel = PHPExcel_IOFactory::load($filename);

echo $filetype = PHPExcel_IOFactory::identify($filename);
$excel2 = PHPExcel_IOFactory::createReader($filetype);
$excel2 = $excel2->load('assets/btob_base_excel.xls'); // Empty Sheet
$excel2->setActiveSheetIndex(0);
$t=0;

$total_invoice_count = 0;
$recipients_count   = array();
$invoice_count      = array();
for($k=5;$k<(count($bTob_gstdata)+5);$k++)
{
    //Adding Data in Excel WorkSheet
    $excel2->getActiveSheet()
    ->setCellValue('A'.$k, $bTob_gstdata[$t]["dist_gstin"]);
    $t++;

}

$excel2->getActiveSheet()->setCellValue('A3', (count($recipients_count)));
$excel2->getActiveSheet()->setCellValue('B3', (count($invoice_count)));
$excel2->getActiveSheet()->setCellValue('D3', '=SUM(D5:D'.(count($bTob_gstdata)+5).')');
$excel2->getActiveSheet()->setCellValue('J3', '=SUM(J5:J'.(count($bTob_gstdata)+5).')');
$excel2->setActiveSheetIndex(0);

$objWriter = PHPExcel_IOFactory::createWriter($excel2, $filetype);
$objWriter->save('btocl_gst_report.xls'); //Saving the excel file
header("location:".base_url("btob_gst_report.xls")); // Downloading the excel file

我想将创建的Excel文件清除为重用