getActiveSheet(); $sheet->setCellValue('A1', 'こんにちは!'); $sheet->setCellValue('B1', 'Hello!'); $filename = File::sysGetTempDir(), 'phpspreadsheet-test-UTF-8'; $writer->useBOM(false); $writer->setOutputEncoding(''); $writer->save($filename); $a = file_get_contents($filename); unlink($filename); $filename = File::sysGetTempDir(), 'phpspreadsheet-test-SJIS-win'; $writer->useBOM(false); $writer->setOutputEncoding('SJIS-win'); $writer->save($filename); $b = file_get_contents($filename); unlink($filename); self::assertEquals(mb_convert_encoding($a, 'SJIS-win'), $b); } }