Leer fichero de excel

composer require phpoffice/phpspreadsheet 1.29 --ignore-platform-reqs
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Reader\Csv;
use PhpOffice\PhpSpreadsheet\Reader\Xlsx;
require_once 'vendor/autoload.php';
$nomFichero = "pepe.xlsx";
$file_mimes = array('text/x-comma-separated-values', 'text/comma-separated-values', 'application/octet-stream', 'application/vnd.ms-excel', 'application/x-csv', 'text/x-csv', 'text/csv', 'application/csv', 'application/excel', 'application/vnd.msexcel', 'text/plain', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
$arr_file = explode('.',$nomFichero);
$extension = end($arr_file);
if ('csv' == $extension) {
$reader = new \PhpOffice\PhpSpreadsheet\Reader\Csv();
} else {
$reader = new \PhpOffice\PhpSpreadsheet\Reader\Xlsx();
}
$spreadsheet = $reader->load($nomFichero);
$worksheet = $spreadsheet->getActiveSheet();
$highestRow = $worksheet->getHighestRow();
$highestColumn = $worksheet->getHighestColumn();
$highestColumnIndex = \PhpOffice\PhpSpreadsheet\Cell\Coordinate::columnIndexFromString($highestColumn);
// A partir de aquí ya recorrer el array