使用php上传大文件后，“没有这样的文件”错误

Question

There is a service for uploading large files (more than 500MB) with php/apache. The progress of upload is tracked by the uploadprogress pecl extension. This scheme works fine only for small file uploads.

However, there is a problem when uploading large files. Once the upload is finished, there is a standard information in the $_FILES array showing there are no errors. The problem is that the /tmp/phpXXXX file itself doesn't exist by this time.

I've tested that if we manually remove the tmp file during the upload, upload process will not stop and the error will be raised only after the upload is finished.

Hosting provider says that there are no maintenance scripts that are removing tmp files. Also it says that such tmp files are available in the filesystem almost until the end of the upload, and then they disappear.

Could it be caused by the apache/server/php configuration? Is there anything in the OS that may affect these tmp files?

OS is Ubuntu 8 LTS

Any help would be appreciated!

Answer 1

There is a number of reasons why uploaded files might not work.

• upload_max_filesize
• post_max_size - needs to be larger than upload_max_filesize

    $POST_MAX_SIZE = ini_get('post_max_size');
    $unit = strtoupper(substr($POST_MAX_SIZE, -1));
    $multiplier = ($unit == 'M' ? 1048576
        : ($unit == 'K' ? 1024 : ($unit == 'G' ? 1073741824 : 1)));

    if (isset($_SERVER['CONTENT_LENGTH'])) {
        if ((int) $_SERVER['CONTENT_LENGTH'] > $multiplier * (int) 
          $POST_MAX_SIZE && $POST_MAX_SIZE) {
            $error = 'POST exceeded maximum allowed size.';
        }
    }

• $_FILES['myfile']['error'] > 0 (see: http://php.net/manual/en/features.file-upload.errors.php)
• File has no name / filename too long (value of $_FILES['myfile']['name'])
• Trying to read a non-multipart upload, using multipart functions (E.G move_uploaded_file / is_uploaded_file returns false)
• upload_tmp_dir not writeable (this is /tmp by default in linux)
• Destination not writeable !is_writable($targetDir)
• Disk full (although this usually gives UPLOAD_ERR_CANT_WRITE error)