titles($category, $functionName, $description); // Create new PhpSpreadsheet object $spreadsheet = new Spreadsheet(); $worksheet = $spreadsheet->getActiveSheet(); for ($n = 0; $n <= 5; ++$n) { for ($x = 0; $x <= 5; $x = $x + 0.25) { Calculation::getInstance($spreadsheet)->flushInstance(); $formula = "BESSELY({$x}, {$n})"; $worksheet->setCellValue('A1', "=$formula"); $helper->log("$formula = " . $worksheet->getCell('A1')->getCalculatedValueString()); } }