$type = trim(strrchr($_POST['test'],'.'),'.');

// print_r($_POST['test']);exit;

if($file['error']==0){
if(!file_exists('./upload/upload.'.$type)){
if(!move_uploaded_file($file['tmp_name'],'./upload/upload.'.$type)){
echo 'failed';
}
}else{
$content=file_get_contents($file['tmp_name']);
if (!file_put_contents('./upload/upload.'.$type,$content,FILE_APPEND)) {
echo 'failed';
}
}
}else{
echo 'failed';
}

?>