PHP File Upload Error Codes; UPLOAD_ERR_OK

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make sure error reporting is on which may provide further detail:

        error_reporting(E_ALL | E_STRICT);

        ini_set('display_errors', 1);

also, check out

http://us.php.net/manual/en/features.file-upload.common-pitfalls.php

http://us.php.net/manual/en/features.file-upload.errors.php

http://us.php.net/manual/en/features.file-upload.post-method.php