php - Uploading profile pictures to users separate folder -

i want know how can place pictures/files(pdf's,ppt's,doc's) users respective folder. if he/she uploads avatar , want upload path:- www.oursite.com/uploads/profile_pics/username/filename.jpg.

my question how can create username directory. below code snippet:-

if (isset($_files['pic']['name'])) {   $_files['pic']['name'] = $pic_uniq_id;//already set using uniqid()   $img_title = $_files['pic']['name'];   $target_dest = "uploads/#profile_faces/here username folder/".$img_title;   $move = move_uploaded_file($_files['pic']['tmp_name'], $target_dest);   if(!$move) {     $img_msg = "<p class='pic_warning' color='red'><font color='red'><b>     sorry! upload failed. try again</b></font></p>";     include 'includes/uploadprofilepicture.inc';      exit();   }else {//go on...} 

how can create directory username's name?

create user name directory using,

mkdir("uploads/#profile_faces/".$username);