İşinin görür galiba
<html>
<body>
<?php
if($_POST['submit']){
echo 'DOLU ';
}else{
echo 'BOŞ';
}
?>
<form action="" method="post" enctype="multipart/form-data">
<input type="file" name="file" id="file" />
<input type="submit" name="submit" value="Gönder" />
</form>
</body>
</html>