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I am sending files uploaded to my server to Amazon S3. To do this, I:

• Use move_uploaded_file() to send file to a temp-uploads folder.


• I use the S3 SDK to upload the file as an object to S3.


• I use unlink() to delete the file.


• 
  unlink() fails with Resource temporarily unavailable
  

Windows Server running PHP/Apache.

I can unlink later after the script is done running. Calling the unlink() command outside of the script deletes the file from the server immediately. I was trying to figure out how to maybe release the file from move_uploaded_file(), but can't find anything after searching for a while.

I do use $thumb1 = new Imagick($filetothumbnail); and create a thumbnail. But I then call

$thumb1->clear();
$thumb1->destroy();

Maybe Imagick still has the file open? However, I have tested this with an excel file which does not make a thumbnail, and the file still fails to delete from the server.

if(isset($_FILES['file'])) $ext == 'jpeg' 

The upload to S3 function is:

$s3Client = new S3Client([
 'version' => 'latest',
 'region' => 'us-east-2',
 'credentials' => [
 'key' => s3key,
 'secret' => s3secret,
 ],
]);

$result = $s3Client->putObject([
 'Bucket' => 'bucketname',
 'Key' => $filename,
 'SourceFile' => $filepath,
]);

A quick look at the docs suggests that the upload is asynchronous:

https://docs.aws.amazon.com/sdk-for-php/v3/developer-guide/guide_promises.html

And you should probably use a promise to create a callback in which you can unlink your file. There are plenty of code examples in the link.

This post helped solve this for me:

https://stackoverflow.com/a/41537354/1766536

Specifically, I had to use fopen/fclose and upload using Body instead of SourceFile