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

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There is no solution, as i have
searched a lot on moving my uploaded image into directory here is my php code
:

 //Profile
            Image upload script
 if (isset($_FILES['profilepic'])) {
 if
            (((@$_FILES["profilepic"]["type"]=="image/jpeg") ||
            (@$_FILES["profilepic"]["type"]=="image/png") ||
            (@$_FILES["profilepic"]["type"]=="image/gif"))&&(@$_FILES["profilepic"]["size"]
            < 1048576)) //1 Megabyte
 {

 $chars =
            "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

            $rand_dir_name = substr(str_shuffle($chars), 0, 15);
 $dir =
            "userdata/profile_pics/$rand_dir_name";
 mkdir($dir);

            move_uploaded_file($_FILES["profilepic"]["tmp_name"],"userdata/profile_pics/$rand_dir_name".$_FILES["profile‌​pic"]["name"]);

            $profile_pic_name = $_FILES["profilepic"]["tmp_name"];
 echo
            $profile_pic_name;
 $profile_pic_query = mysqli_query($conn,"UPDATE users2 SET
            profile_pic='$rand_dir_name/$profile_pic_name' WHERE
            username='$user'");

 }

 else

            {
 $msg5 = "Invailid File! Your image must be no larger than 1MB and it must
            be either a .jpg, .jpeg, .png or .gif";
 }

            }

?>

but
when I try to upload image,it creates the random folder in userdata/profile_pics but it
doesn't move the file into random folder directory i have also created a custom php.ini
file with file_uploads = On, but i recieve the following warning when i submit the form
:-

Warning: move_uploaded_file():
The second argument to copy() function cannot be a directory in
/home/rahulkapoor90/public_html/note.php on line
26

Warning: move_uploaded_file(): Unable to move
'/tmp/phpO592dd' to 'userdata/profile_pics/zAGC9wOhVyoe3R5' in
/home/rahulkapoor90/public_html/note.php on line 26
/tmp/phpO592dd

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Answer

For anyone else who comes across this error,
in my case it was a permissions issue. I re-factored some legacy code and checked the
wrong directory for permissions and instead kept getting this misleading error
message.