Move_uploaded_file does not work in php

Question

$dir = dirname(__FILE__) . '\\' . $_FILES['inputfile']['name']; move_uploaded_file($_FILES['inputfile']['tmp_name'], $dir);

what specifically does not work, fashionable in more detail, add a printout of the $ _FILES variable, show the relevant sections of phpinfo
Check the logs, and the tmp , perhaps move_uploaded_file trying to move the file to a directory that does not exist.
Why after the full path, write 2 slashes, and then the file name?
For the place of 2 slashes, write DIRECTORY_SEPARATOR , if you use php 5.3 and higher, for the place dirname , use __DIR__ .
Usually such a mistake happens from the wrong way or the lack of rights to write to the directory

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