php - The second argument to copy() function cannot be a directory in move_uploaded_file

Im studying how to upload PDF with php and Im having a problem that Im not able to find what I have wrong.

I have an input type = "file" like this:

             Choose a PDF: 
            
 

And then I have the code below, to create a directory to store pdfs, if the directory didnt exist yet.

if(!empty($_FILES['pdf']['tmp_name'])){


        $folder = '../uploads/pdfs';
        $year   = date('Y');
        $month  = date('m');

        if(!file_exists($folder.$year)){
           mkdir($folder.$month,0755);

        }
        if(!file_exists($folder.$year.'/'.$month)){

            mkdir($folder.$year.'/'.$month,0755);
        }

         $mypdf = $_FILES['pdf'];
        $ext = substr($img['name'],-3);
        $f['pdf'] = $year.'/'.$month.'/'.$f['url'].'.'.$ext;
        move_uploaded_file($mypdf['tmp_name'], $folder.$year.'/'.$month.'/');

    }

The mkdir to create the directory is working fine but the pdf its not uploading.

And Im getting this errors:

Warning: move_uploaded_file(): The second argument to copy() function cannot be a directory in move_uploaded_file($mypdf['tmp_name'], $folder.$year.'/'.$month.'/');

Warning: move_uploaded_file(): Unable to move 'F:\Xampp\tmp\php1BD6.tmp' to '../uploads/pdfs2014/04/' in move_uploaded_file($mypdf['tmp_name'], $folder.$year.'/'.$month.'/');

Answer

You need to specify a filename to the move_uploaded_files function as well, so it knows where to save the file(directory) and under what filename.

move_uploaded_file($mypdf['tmp_name'], $folder.$year.'/'.$month.'/'."my_newly_uploaded_file.pdf");

or if you want to keep the original filename

move_uploaded_file($mypdf['tmp_name'], $folder.$year.'/'.$month.'/'.$mypdf["name"]);