【发布时间】：2019-10-03 00:20:58
【问题描述】：
我正在使用 Dropzone.js 获取各种类型的文件（包括图像和非图像，如 PDF），并将它们以 1mb 的块上传到我们的服务器。然后我尝试用 PHP 连接文件，然后将它们上传到我们公司的 FileMaker 数据库。
到目前为止，我已经能够按应有的方式将要上传的文件分块上传。我将它们全部存储在具有相同“代号”的临时“上传”文件夹中，并在每个名称的末尾附加“-INDEX#”（INDEX# 是正在上传的块 #，由 Dropzone 传递）。
我已将故障隔离到循环通过已上传的块以获取内容的 PHP 部分。具体来说，当我去获取内容时，我尝试使用 PHP 的“真实路径”将块的文件路径保存到一个变量中，以获取绝对路径，并作为文件存在的真/假检查。毫无疑问，PHP 无法“看到”该文件。
我不是文件夹权限方面的专家，因此很有可能与此有关，我只是不知道如何处理它。你会看到我确实在uploads/目录的PHP顶部尝试了一个chmod。
我只包含了下面的 PHP 代码，没有包含任何 javascript。我不确定 JS 是否相关，因为它显然与实际的块上传工作得很好。
下面的 PHP 文件与块要结束的 uploads/ 文件夹位于同一目录中。
<?php
header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");
/* ========================================
VARIABLES
======================================== */
// chunk variables
$fileId = $_POST['dzuuid'];
$chunkIndex = $_POST['dzchunkindex'] + 1;
$chunkTotal = $_POST['dztotalchunkcount'];
// file path variables
$ds = DIRECTORY_SEPARATOR;
$targetPath = dirname( __FILE__ ) . "{$ds}uploads{$ds}";
$fileType = strtolower(pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION));
$fileSize = $_FILES["file"]["size"];
$filename = "{$fileId}-{$chunkIndex}.{$fileType}";
$targetFile = $targetPath . $filename;
// change directory permissions
chmod(realpath($targetPath), 0777);
/* ========================================
DEPENDENCY FUNCTIONS
======================================== */
$returnResponse = function ($info = null, $filelink = null, $status = "error") {
die (json_encode( array(
"status" => $status,
"info" => $info,
"file_link" => $filelink
)));
};
/* ========================================
VALIDATION CHECKS
======================================== */
// I removed all the validation code here. They just prevent upload, so assume the upload is going through.
/* ========================================
CHUNK UPLOAD
======================================== */
move_uploaded_file($_FILES['file']['tmp_name'], $targetFile);
// Be sure that the file has been uploaded
if ( !file_exists($targetFile) ) $returnResponse("An error occurred and we couldn't upload the requested file.");
/* ========================================
FINAL UPLOAD CONDITIONAL
======================================== */
if ( $chunkIndex == $chunkTotal ) {
// ===== concatenate uploaded files =====
// set emtpy string for file content concatonation
$file_content = "";
// loop through temp files and grab the content
for ($i = 1; $i <= $chunkTotal; $i++) {
// target temp file
$temp_file_path = realpath("{$targetPath}{$fileId}-{$i}.{$fileType}") or $returnResponse("Your chunk was lost mid-upload.");
// ^^^^^^^ this is where the failure is occurring, $i = 1, so first iteration
// copy chunk...you'll see a bunch of methods included below that I've tried, but the simplest one is method 3, so I've tested mostly there
// method 1
/*$temp_file = fopen($temp_file_path, "rb") or $returnResponse("The server cannot open your chunks");
$chunk = base64_encode(fread($temp_file, $fileSize));
fclose($temp_file);
// method 2
$chunk = base64_encode(stream_get_contents($temp_file_path, $fileSize));*/
// method 3
$chunk = base64_encode(file_get_contents($temp_file_path));
// check chunk content
if ( empty($chunk) ) $returnResponse("Chunks are uploading as empty strings.");
// add chunk to main file
$file_content .= $chunk;
// delete chunk
unlink($temp_file_path);
if ( file_exists($temp_file_path) ) $returnResponse("Your temp files could not be deleted.");
continue;
}
// create and write concatonated chunk to the main file
file_put_contents("{$targetPath}{$fileId}.{$fileType}", base64_decode($file_content));
// other method of adding contents to new file below, but the one above seemed simpler
//$final = fopen("{$target_file}.{$fileType}", 'ab');
//fwrite($final, base64_decode($file_content));
//fclose($final);
// create new FileMaker code removed here, irrelevant
// run FileMaker script to populate container field with concatenated file code removed here, irrelevant
// somewhere in the code above, if everything succeeds, I unlink the concatenated file so that it's not cluttering my "uploads" folder, but I never get this far
} else {
$returnResponse(null, null, "success");
}
【问题讨论】：
标签： php jquery file-upload dropzone.js chunking