PHP大文件上传限制解决方案：动态配置与分块上传实践

<?php // 尝试将单个文件上传大小限制设置为 600MB ini_set("upload_max_filesize", "600M"); ini_set("memory_limit", "1024M"); // 建议同时调整内存限制以处理大文件  // 后续的文件上传处理逻辑 if (isset($_FILES['video']) && $_FILES['video']['error'] == UPLOAD_ERR_OK) {$uploadDir = 'uploads/';     $uploadFile = $uploadDir . basename($_FILES['video']['name']);      if (move_uploaded_file($_FILES['video']['tmp_name'], $uploadFile)) {echo " 文件上传成功！";} else {echo " 文件上传失败。";} } else {echo " 没有文件上传或上传出错。错误码：" . ($_FILES['video']['error'] ?? '未知'); } ?>

<?php // 设置响应头，允许  跨域  请求（如果  前端  和后端  部署在不同域名）header('access-Control-Allow-Origin: *'); header('Access-Control-Allow-Methods: POST, GET, OPTIONS'); header('Access-Control-Allow-Headers: Content-Type, Authorization, X-Requested-With');  // 确保上传目录存在且可写 $uploadDir = 'uploads/'; if (!is_dir($uploadDir)) {mkdir($uploadDir, 0777, true); }  if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {// 预检请求直接返回成功     http_response_code(200);     exit();}  if (isset($_FILES['chunk']) && $_FILES['chunk']['error'] == UPLOAD_ERR_OK) {$fileName = $_POST['fileName'] ?? 'unknown_file';     $fileIdentifier = $_POST['fileIdentifier'] ?? uniqid(); // 文件的唯一标识符     $chunkIndex = (int)($_POST['chunkIndex'] ?? 0);     $totalChunks = (int)($_POST['totalChunks'] ?? 1);      // 为当前文件创建一个独立的临时存储目录     $tempFileDir = $uploadDir . $fileIdentifier . '/';     if (!is_dir($tempFileDir)) {mkdir($tempFileDir, 0777, true);     }      // 将当前块保存到临时目录     $chunkFilePath = $tempFileDir . $chunkIndex . '.part';     if (move_uploaded_file($_FILES['chunk']['tmp_name'], $chunkFilePath)) {// 检查所有块是否都已上传         $allChunksUploaded = true;         for ($i = 0; $i < $totalChunks; $i++) {if (!file_exists($tempFileDir . $i . '.part')) {$allChunksUploaded = false;                 break;}         }          if ($allChunksUploaded) {// 所有块都已上传，开始合并             $finalFilePath = $uploadDir . $fileName;             $outputFile = fopen($finalFilePath, 'wb');              for ($i = 0; $i < $totalChunks; $i++) {$partFilePath = $tempFileDir . $i . '.part';                 $chunkContent = file_get_contents($partFilePath);                 fwrite($outputFile, $chunkContent);                 unlink($partFilePath); // 合并后删除分块文件             }             fclose($outputFile);             rmdir($tempFileDir); // 删除临时目录              echo json_encode(['status' => 'success', 'message' => '文件上传并合并完成！', 'filePath' => $finalFilePath]);         } else {echo json_encode(['status' => 'success', 'message' => '块' . $chunkIndex . '接收成功。等待其他块。']);         }     } else {echo json_encode(['status' => 'error', 'message' => '无法保存文件块。']);     } } else {echo json_encode(['status' => 'error', 'message' => '没有文件块上传或上传出错。']); } ?>

// 这是一个高度简化的概念，实际应用需要更复杂的逻辑，如错误重试、进度条、UI 交互等。async function uploadFileInChunks(file) {const chunkSize = 1024 * 1024 * 5; // 5MB chunks     const totalChunks = Math.ceil(file.size / chunkSize);     const fileIdentifier = Date.now() + '-' + file.name; // 唯一标识符      for (let i = 0; i < totalChunks; i++) {const start = i * chunkSize;         const end = Math.min(file.size, start + chunkSize);         const chunk = file.slice(start, end);          const formData = new FormData();         formData.append('chunk', chunk);         formData.append('fileName', file.name);         formData.append('fileIdentifier', fileIdentifier);         formData.append('chunkIndex', i);         formData.append('totalChunks', totalChunks);          try {const response = await fetch('upload_handler.php', {                 method: 'POST',                 body: formData,});             const result = await response.json();             console.log(`Chunk ${i}/${totalChunks} uploaded:`, result);             // 更新进度条等         } catch (error) {console.error(`Error uploading chunk ${i}:`, error);             // 处理上传失败，可能需要重试             return;         }     }     console.log('All chunks uploaded and merged!'); }  // 示例调用 // const fileInput = document.getElementById('fileInput'); // fileInput.addEventListener('change', (event) => {//     const selectedFile = event.target.files[0]; //     if (selectedFile) {//         uploadFileInChunks(selectedFile); //     } // });