将二进制文件上传到服务器

I'm converting an image to a binary file in IOS, which works just fine. This will be handled by my php script which is suppose to upload this image to my ubuntu server. The problem is i keep getting file=unsuccessful. i've tried different directory paths, but cant seem to solve this issue.

This $directory will return this: /var/www/User/core/ios/

<?
if(!empty($_POST)) 
{
    $message = $_POST['message'];
    $directory = $_SERVER['DOCUMENT_ROOT'] . '/User/core/ios/';

    $file = basename($_FILES['userfle']['upload']);
    $uploadfile = $directory . $file;
    var_dump($_FILES);
    $randomPhotoID = md5(rand() * time());
    echo 'file='.$file;

echo $file;
if (move_uploaded_file($_FILES['userfle']['tmp_name'], $uploadfile)) {
       echo 'successful';

    }
    else
    {
    echo 'unsuccessful';

}
}
else
{
    echo('Empty post data');
}
?>

Check the error file of your php(you can make sure if you enabled the error log in php.ini), if you don't have the permission or for some other reasons it can't move the file ,there will be a record in that file.
Some time you can try the command setenforce 0 if you confirm you(I means the user of apache) have the permission to move the file but it not work.
By the way if the file you want to move is not upload by post, there is no error log and the move function will return false.