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PHP Query regarding temporarily-uploaded files

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I have a requirement, wherein I need to allow vanilla uploads of files to a HTTPD server.

Any client can upload any number of files (one at a time). Also, there is just one directory, where the files get stored "finally" (that is, after being copied from the temporary location, via "move_uploaded_file")

Also, I have been able to get the simple file uploading running via PHP, by picking up one of the numerous "Hello World" examples available :)

Now, I am facing the following use-case ::

1) User 1 starts uploading a large file, say "big_file.avi".

2) Meanwhile, user 2 also starts uploading a (different) file, but with the same name "big_file.avi".

In an ideal scenario, user 2 should be prompted with a message, that a file of the same name is already being uploaded by someone else somewhere. Is there a way to do this?

( Note that, had the user 2 started uploading AFTER user 1 had finished with the upload, we could probably modify the PHP-script at the sever-side, to let user-2 know that a file of the same name already exits. But I am failing to find a solution, when the user 2 starts the upload WHILE the large file of user 1 is in the process of completing uploading).

Any way the issue may be solved?

posted Jul 10, 2013 by anonymous

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1 Answer

+1 vote
 
Best answer

This is not possible with PHP, PHP will not know about the file until the upload is completed. You can use HTML5 or flash(not recommended) for an alternative way of uploading, and then you can check the file name in advance.

answer Jul 10, 2013 by anonymous
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