$subject
$subject : \PhpOffice\PhpSpreadsheet\Spreadsheet
Spreadsheet to iterate.
$subject : \PhpOffice\PhpSpreadsheet\Spreadsheet
Spreadsheet to iterate.
__construct(\PhpOffice\PhpSpreadsheet\Spreadsheet $subject)
Create a new worksheet iterator.
\PhpOffice\PhpSpreadsheet\Spreadsheet | $subject |