我正在使用Dropzone.js来上传各种类型的文件（包括图像和非图像文件，如PDF），并将它们分成1MB的块上传到我们的服务器。然后，我尝试使用PHP将这些文件连接起来，并稍后将它们上传到我们公司的FileMaker数据库。
到目前为止，我已经成功地将文件按照应该的方式分成了块并上传。我将它们全部存储在一个临时的“uploads”文件夹中，具有相同的“代号”，每个名称末尾都附加了“-INDEX#”（INDEX#是通过Dropzone传递的上传块数）。
我将故障隔离到了PHP循环遍历已上传的块以获取内容的部分。具体来说，当我尝试获取内容时，我尝试使用PHP的“realpath”将块的文件路径保存到变量中，以获取绝对路径，并作为文件存在的真/假检查。不出意外，PHP无法“看到”该文件。
我不是文件夹权限方面的专家，所以很可能与此有关，并且我不知道如何处理它。您会发现我在uploads/目录的PHP顶部尝试了chmod。
下面仅包含PHP代码，没有JavaScript代码。我不确定JS是否相关，因为它似乎与实际的块上传工作正常。
下面的PHP文件与块要到达的uploads/文件夹位于同一目录中。
到目前为止，我已经成功地将文件按照应该的方式分成了块并上传。我将它们全部存储在一个临时的“uploads”文件夹中，具有相同的“代号”，每个名称末尾都附加了“-INDEX#”（INDEX#是通过Dropzone传递的上传块数）。
我将故障隔离到了PHP循环遍历已上传的块以获取内容的部分。具体来说，当我尝试获取内容时，我尝试使用PHP的“realpath”将块的文件路径保存到变量中，以获取绝对路径，并作为文件存在的真/假检查。不出意外，PHP无法“看到”该文件。
我不是文件夹权限方面的专家，所以很可能与此有关，并且我不知道如何处理它。您会发现我在uploads/目录的PHP顶部尝试了chmod。
下面仅包含PHP代码，没有JavaScript代码。我不确定JS是否相关，因为它似乎与实际的块上传工作正常。
下面的PHP文件与块要到达的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");
}