Laravel Excel3.0导出

<?phpnamespace App\Exports;use Maatwebsite\Excel\Concerns\FromCollection;use Maatwebsite\Excel\Concerns\ShouldAutoSize;use Maatwebsite\Excel\Concerns\WithColumnFormatting;use Maatwebsite\Excel\Concerns\WithCustomValueBinder;use Maatwebsite\Excel\Concerns\WithEvents;use Maatwebsite\Excel\Concerns\WithStrictNullComparison;use Maatwebsite\Excel\Events\AfterSheet;use PhpOffice\PhpSpreadsheet\Cell\StringValueBinder;use PhpOffice\PhpSpreadsheet\Style\NumberFormat;
class Export extends StringValueBinder implements FromCollection,    ShouldAutoSize,WithColumnFormatting,WithCustomValueBinder,WithStrictNullComparison,WithEvents{    private $row;    private $data;    private $mergeCell;    private $columnName;    private $formatNumber;
    /*     * $mergeCell $columnName ：合并单元格所需参数;     * $mergeCell 需要合并的位置数组以MAP形式存储 [开始行=>结束行]     * $columnName 需要合并列 与合并行数结合使用ARRAY存储 ['A','B']     */    public function __construct($row,$data,$mergeCell=null,$columnName=null,$formatNumber=[]){        $this->row = $row;        $this->data = $data;        $this->mergeCell = $mergeCell;        $this->columnName = $columnName;        $this->formatNumber = $formatNumber;    }
    public function collection(){        $row = $this->row;        $data = $this->data;
//设置表头        foreach ($row[0] as $key => $value) {            $key_arr[] = $key;        }
//输入数据        foreach ($data as $key => &$value) {            $js = [];            for ($i=0; $i < count($key_arr); $i++) {                $js = array_merge($js,[ $key_arr[$i] => $value[ $key_arr[$i] ] ]);            }            array_push($row, $js);            unset($val);        }        return collect($row);    }    public function registerEvents(): array{        // TODO: Implement registerEvents() method.        if ($this->mergeCell && $this->columnName){            return [                AfterSheet::class => function(AfterSheet $event){                    foreach ($this->columnName as $column){                        foreach ($this->mergeCell as $key=>$value){                            $event->sheet->getDelegate()->mergeCells($column.$key.':'.$column.$value);                        }                    }                }            ];        }        return [];    }
    public function columnFormats(): array{        $formatNumber = [];        foreach ($this->formatNumber as $column){            $formatNumber[$column] = NumberFormat::FORMAT_TEXT;        }        return $formatNumber;    }}

/*表头表体都为二维数组*/$row=[['row1'=>'列1','row2'=>'列2']];/*与表头key对应，缺少数据报错*/$list=[['row1'=>'行1列1'，'row2'=>'行1列2'],['row1'=>'行2列1'，'row2'=>'行2列2']];/*将第一行到第三行，第五行到第七行的A,B,C列各自合并*/$mergeCell=[1=>3,5=>7];$columnName=["A","B","C"];/*数字过长的列转换格式防止科学计数*/$formatNumber=['A','B','C'];//上方A,B,C列都为示意，根据自己需求调整，对应EXCEL的列return Excel::download(new Export($row,$list,$mergeCell,$columnName，$formatNumber),'fileName');