mkdir() says theres no such directory and fails?

Question

Im likely doing something very simply wrong, but when I try to make a directory (using a variable of an insert just performed as the last folder name), I get the error:

Answer 1

• recursive Allows the creation of nested directories specified in the path name.
• but did not work for me!! for that here is what i came up with!!
• and it work very perfect!!

$upPath = "../uploads/RS/2014/BOI/002"; // full path
$tags = explode('/' ,$upPath); // explode the full path
$mkDir = "";

foreach($tags as $folder) {          
    $mkDir = $mkDir . $folder ."/";   // make one directory join one other for the nest directory to make
    echo '"'.$mkDir.'"<br/>';         // this will show the directory created each time
    if(!is_dir($mkDir)) {             // check if directory exist or not
      mkdir($mkDir, 0777);            // if not exist then make the directory
    }
}