php - move_uploaded_file() is not working but file is uploaded? -

so i'm trying create code creates , publishes file webroot, modifies , writes file, , change location of file directory/folder using move_uploaded_file()

this code far

$myfile = fopen($_post['title'].".txt", "w"); move_uploaded_file($myfile,'$dir/$title.txt'); fwrite($myfile, $_post['textarea11']); fclose($myfile); 

the code doesn't work, i've tried echoing move_uploaded_file() , returned nothing, file uploaded it's location wasn't changed.

$dir defined $dir = __dir__.'/../uploads/'; , $title define $title = $_post['title'];

move_uploaded_file() can used if submitting multipart form , want save uploaded file.

what need this: http://php.net/manual/en/function.rename.php