@php $grading = true; // 生成识别码:判卷以2开头 + 15位paper_id数字部分 $rawPaperId = $paper->paper_id ?? 'unknown'; preg_match('/paper_(\d{15})/', $rawPaperId, $matches); $paperIdNum = $matches[1] ?? preg_replace('/[^0-9]/', '', $rawPaperId); $gradingCode = '2' . $paperIdNum; @endphp