Add directory and set permissions rewritable in Linux PHP

$directory = 'images/author_pic/james';

if(check_dir($directory))
{
     echo "Direcotry Created"
} else {
     echo "directory not created something went wrong!";
}




// create writable directory or change the chmod permission of chosen directory

function check_dir($dir) {

    if (!file_exists($dir)) {
         if (mkdir($dir, 0777))// create images dir
            $done = true;

    } else if (!is_writeable($dir)) {
        if (chmod($dir, 0777)) // change perm. setting
            $done = true;

    } else
        $done = true;

    return $done;
}