## Spreadsheet 支持excel 函数 公式使用
```
<?php
namespace app
# 给类文件的命名空间起个别名
use PhpOffice\PhpSpreadsheet\Spreadsheet;
# Xlsx类 将电子表格保存到文件
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
# 实例化 Spreadsheet 对象
$spreadsheet = new Spreadsheet();
# 获取活动工作薄
$sheet = $spreadsheet->getActiveSheet();
$sheet->setCellValue('A1','10');
$sheet->setCellValue('B1','15');
$sheet->setCellValue('C1','20');
$sheet->setCellValue('D1','25');
$sheet->setCellValue('E1','30');
$sheet->setCellValue('G1','35');
$sheet->setCellValue('A2', '总数：');
$sheet->setCellValue('B2', '=SUM(A1:G1)');
$sheet->setCellValue('A3', '平均数：');
$sheet->setCellValue('B3', '=AVERAGE(A1:G1)');
$sheet->setCellValue('A4', '最小数：');
$sheet->setCellValue('B4', '=MIN(A1:G1)');
$sheet->setCellValue('A5', '最大数：');
$sheet->setCellValue('B5', '=MAX(A1:G1)');
$sheet->setCellValue('A6', '最大数：');
$sheet->setCellValue('B6', '\=MAX(A1:G1)'); // 使用转义字符
// 批量赋值
$sheet->setCellValue('A1','ID');
$sheet->setCellValue('B1','姓名');
$sheet->setCellValue('C1','年龄');
$sheet->setCellValue('D1','身高');
$sheet->fromArray(
[
[1,'欧阳克','18岁','188cm'],
[2,'黄蓉','17岁','165cm'],
[3,'郭靖','21岁','180cm']
],
3,
'A2'
);
// 合并单元格 合并后，赋值只能给A1，开始的坐标。
$sheet->mergeCells('A1:B5');
$sheet->getCell('A1')->setValue('欧阳克');
# Xlsx类 将电子表格保存到文件
$writer = new Xlsx($spreadsheet);
$writer->save('1.xlsx');
// 客户端文件下载
header('Content-Type:application/vnd.ms-excel');
header('Content-Disposition:attachment;filename=1.xls');
header('Cache-Control:max-age=0');
$writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Xls');
$writer->save('php://output');
```
### 读取表格文件
```
<?php
namespace app;
# 创建读操作
$reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader('Xlsx');
# 打开文件、载入excel表格
$spreadsheet = $reader->load('1.xlsx');
# 获取活动工作薄
$sheet = $spreadsheet->getActiveSheet();
# 获取 单元格值 和 坐标
$cellC1 = $sheet->getCell('B2');
echo '值: ', $cellC1->getValue(),PHP_EOL;
echo '坐标: ', $cellC1->getCoordinate(),PHP_EOL;
$sheet->setCellValue('B2','欧阳锋');
# 获取 单元格值 和 坐标
$cellC2 = $sheet->getCell('B2');
echo '值: ', $cellC2->getValue(),PHP_EOL;
echo '坐标: ', $cellC2->getCoordinate();
```
#### 导入功能
```
<?php
$file = $_FILES['file']['tmp_name'];
# 载入composer自动加载文件
require 'vendor/autoload.php';
# 载入方法库
require 'function.php';
# 创建读操作
$reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader('Xlsx');
# 打开文件、载入excel表格
$spreadsheet = $reader->load($file);
# 获取活动工作薄
$sheet = $spreadsheet->getActiveSheet();
# 获取总列数
$highestColumn = $sheet->getHighestColumn();
# 获取总行数
$highestRow = $sheet->getHighestRow();
# 列数 改为数字显示
$highestColumnIndex = \PhpOffice\PhpSpreadsheet\Cell\Coordinate::columnIndexFromString($highestColumn);
$log = [];
for($a=2;$a<$highestRow;$a++){
$title = $sheet->getCellByColumnAndRow(1,$a)->getValue();
$cat_fname = $sheet->getCellByColumnAndRow(2,$a)->getValue();
$cat_name = $sheet->getCellByColumnAndRow(3,$a)->getValue();
$price = $sheet->getCellByColumnAndRow(4,$a)->getValue();
$img = $sheet->getCellByColumnAndRow(5,$a)->getValue();
$cat_fid = find('shop_cat','id','name="'.$cat_fname.'"');
$cat_id = find('shop_cat','id','name="'.$cat_name.'"');
$data = [
'title' => $title,
'cat_fid' => $cat_fid['id'],
'cat_id' => $cat_id['id'],
'price' => $price,
'img' => $img,
'add_time' => time(),
];
$ins = insert('shop_list',$data);
if($ins){
$log[] = '第'.$a.'条，插入成功';
}else{
$log[] = '第'.$a.'条，插入失败';
}
}
echo json_encode(['code'=>0,'msg'=>'成功','data'=>$log]);
```
