PhpSpreadsheet_php file_put_contents

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php用PhpSpreadsheet对Excel进行读取、写入、修改十分便捷，下面将我在工作中用到过的操作进行总结。文档参考百度搜索和原始文档：https://phpspreadsheet.readthedocs.io/en/latest/（只有英文版）
首先要引入php模块: composer require phpoffice/phpspreadsheet
1、读取Excel：见文章PhpSpreadsheet读取单元格内容的坑
2、修改Excel：示例代码（只保留了基础代码）：

$this->view->title = '填写Excel';
$abs_excel_path = $_SERVER['DOCUMENT_ROOT'] . '/data_be_writen.xlsx';
$spreadsheet = \PhpOffice\PhpSpreadsheet\IOFactory::load($abs_excel_path);
$count = 0;
// 三个sheet都进行修改
for ($sheetIndex=0; $sheetIndex<3; $sheetIndex++) { 
   
    $worksheet = $spreadsheet->getSheet($sheetIndex);
    $highestRow = $worksheet->getHighestRow(); // 总行数1, 2，3
    for ($rowIndex = 1; $rowIndex <= $highestRow; $rowIndex++) { 
   
    	$count++;
    	// 写入的数据只是个示例，具体项目中根据需求获取数值写入
        $worksheet->getCellByColumnAndRow(1, $rowIndex)->setValue($rowIndex);
        $worksheet->getCellByColumnAndRow(2, $rowIndex)->setValue($rowIndex * 10);
    }
}
echo "填写了${count}条数据";
$writer = new \PhpOffice\PhpSpreadsheet\Writer\Xlsx($spreadsheet);
$writer->save($abs_excel_path);

3、写入Excel，下面的代码提现了一个导出账号的过程，是基于ThinkPHP5.0的：

$head = ['部门', '姓名', '职位', '手机号', '邮箱'];
$count = count($head);

$spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet();
$worksheet = $spreadsheet->getActiveSheet();

$worksheet->getColumnDimension('A')->setWidth(20);
$worksheet->getColumnDimension('B')->setWidth(12);
$worksheet->getColumnDimension('C')->setWidth(12);
$worksheet->getColumnDimension('D')->setWidth(18);
$worksheet->getColumnDimension('E')->setWidth(20);

$rowIndex = 1;
foreach ($head as $colIndex => $title) { 
   
    $worksheet->getCellByColumnAndRow($colIndex + 1, $rowIndex)->setValue($title);
}

$admins = $this->order('id asc')->select();
foreach ($admins as $admin) { 
   
    $rowIndex++;
    $worksheet->getCellByColumnAndRow(1, $rowIndex)->setValue(model('Department')->get_name_by_id($admin['department_id']));
    $worksheet->getCellByColumnAndRow(2, $rowIndex)->setValue($admin['username']);
    $worksheet->getCellByColumnAndRow(3, $rowIndex)->setValue($admin['position']);
    $worksheet->getCellByColumnAndRow(4, $rowIndex)->setValue($admin['phone']);
    $worksheet->getCellByColumnAndRow(5, $rowIndex)->setValue($admin['email']);
}

header('Content-Type: application/vnd.ms-excel');
header('Content-Disposition: attachment;filename="账号.xlsx"');
header('Cache-Control: max-age=0');
$writer = new \PhpOffice\PhpSpreadsheet\Writer\Xlsx($spreadsheet);
$writer->save('php://output');

//删除清空：
$spreadsheet->disconnectWorksheets();
unset($spreadsheet);
exit;

4、修改单元格样式的，代码进行了精简，具体要标记哪个，根据项目实际判断：

$this->view->title = '填写Excel';
$abs_excel_path = $_SERVER['DOCUMENT_ROOT'] . '/2.xlsx';
$styleArray = [
    'borders' => [
        'outline' => [
            'borderStyle' => \PhpOffice\PhpSpreadsheet\Style\Border::BORDER_THICK,
            'color' => ['argb' => 'FFFF0000'],
        ],
    ],
];
$spreadsheet = \PhpOffice\PhpSpreadsheet\IOFactory::load($abs_excel_path);
$count = 0;
for ($sheetIndex=0; $sheetIndex<3; $sheetIndex++) { 
   
    $worksheet = $spreadsheet->getSheet($sheetIndex);
    $highestRow = $worksheet->getHighestRow(); // 总行数1, 2，3
    $excel_data = new \app\admin\model\ExcelData2;
    for ($rowIndex = 2; $rowIndex <= $highestRow; $rowIndex++) { 
   
        $worksheet->getStyle("B{ 
     $rowIndex}")->applyFromArray($styleArray);
    }
}
echo "发现了${count}条数据";
$writer = new \PhpOffice\PhpSpreadsheet\Writer\Xlsx($spreadsheet);
$writer->save($_SERVER['DOCUMENT_ROOT'] . '/2标记.xlsx');

注意：对比2、4可以发现：读取了Excel以后，如果要改写，只需要两行代码，在save的时候填写的绝对路径跟读取的一样，则为改写，如果不同，则为新建。