How to create directory using username within theme

Question

I have the following code to save the uploaded file to a static directory.

<?php
//set the image size in mb
$max_upload_size='10';
$MAXIMUM_FILESIZE = $max_upload_size * 1024 * 1024; 
$uploaddir = './uploads/file/'; 
$file = $uploaddir . basename($_FILES['uploadfile']['name']); 
if ($_FILES['uploadfile']['size']<$MAXIMUM_FILESIZE) {
if (move_uploaded_file($_FILES['uploadfile']['tmp_name'], $file)) { 
  echo "success"; 
} else {
echo "error";
}
}else{
echo"size_error";
}
?>

But what I want is to create a username directory under "/uploads/file/". For example if the username is "john", then it should create a folder like "/uploads/file/john/" and saved the file under that folder.

Answer 1

Note - User needs to be logged in to work

global $current_user;
get_currentuserinfo();
$uploaddir = './uploads/file/'.$current_user->user_login.'/'; 
wp_mkdir_p( $uploaddir );

Reference - wp_mkdir_p() -