Laravel Excel 中的一些小细节

excel导出后，显示科学计数

以往的方式都是在后面加"\t"，加一些单引号的字符 这种方式能解决问题，但对数据进行来污染

通过以下方式进行解决

参考 Custom Formatting Values

ps：还是要多看国外文档呀

代码如下

	<?php
		namespace App\Admin\Extensions;
		use Illuminate\Support\Str;
		use Maatwebsite\Excel\Concerns\Exportable;
		use Maatwebsite\Excel\Concerns\FromQuery;
		use Maatwebsite\Excel\Concerns\WithHeadings;
		use Encore\Admin\Grid\Exporters\AbstractExporter;
		use PhpOffice\PhpSpreadsheet\Cell\Cell;
		use PhpOffice\PhpSpreadsheet\Cell\DataType;
		use Maatwebsite\Excel\Concerns\WithCustomValueBinder;
		use PhpOffice\PhpSpreadsheet\Cell\DefaultValueBinder;
		
		class AdmissionsExporter extends AbstractExporter implements FromQuery, WithHeadings,WithCustomValueBinder
		{
			use Exportable;
			
			public function bindValue(Cell $cell, $value)
			{

				$cell->setValueExplicit($value, DataType::TYPE_STRING);

				return true;

			}
			/**
			 * @var string
			 */
			protected $fileName='考生状态表.xlsx';

			/**
			 * @var array
			 */
			protected $headings = [];

			/**
			 * @var array
			 */
			protected $columns = [

				'name'   => '姓名',
				'idcard'=>'身份证号',
				'exam_id'=>'准考证号',
				'exam_type'=>'考生类别',
				'payment_status'=>'缴费状态',
				'from'=>'缴费来源'

			];

			/**
			 * @return array
			 */
			public function headings(): array
			{
				if (!empty($this->columns)) {
					return array_values($this->columns);
				}

				return $this->headings;
			}


			/**
			 * @return \Illuminate\Database\Eloquent\Builder|\Illuminate\Database\Eloquent\Model
			 */
			public function query()
			{
				if (!empty($this->columns)) {
					$columns = array_keys($this->columns);

					$eagerLoads = array_keys($this->getQuery()->getEagerLoads());

					$columns = collect($columns)->reject(function ($column) use ($eagerLoads) {
						return Str::contains($column, '.') || in_array($column, $eagerLoads);
					});

					return $this->getQuery()->select($columns->toArray());
				}

				return $this->getQuery();
			}

			/**
			 * {@inheritdoc}
			 */
			public function export()
			{
				$this->download($this->fileName)->prepare(request())->send();

				exit;
			}
		}