name : RemembersChunkOffset.php <?php namespace Maatwebsite\Excel\Concerns; trait RemembersChunkOffset { /** * @var int|null */ protected $chunkOffset; /** * @param int $chunkOffset */ public function setChunkOffset(int $chunkOffset) { $this->chunkOffset = $chunkOffset; } /** * @return int|null */ public function getChunkOffset() { return $this->chunkOffset; } }