Como posso tratar melhor meu codigo If else no meu update de arquivos

<?

// -------- UPDATE ------------------

	case 'update':
 $id = $_POST['id'];
 $titulo = $_POST['titulo'];
 $doc1 = $_POST['doc1'];
 $doc2 = $_POST['doc2'];

 // Pasta Documento(s)
 $upload_dir = '../../../upload/documentos/';

 // Se Upload for só o doc1 ------------------------------------------------------------------------------------------------------------------------------------------//
 if ($doc1 == "" and $doc2 <> "") {
 $doc1= $_FILES['doc1']['name'];
 $upload_file1 = $upload_dir . $_FILES['doc1']['name'];
 move_uploaded_file($_FILES['doc1']['tmp_name'], $upload_file1);

 $sql = "UPDATE tb_documentos SET titulo=:titulo, doc1=:doc1, doc2=:doc2, WHERE id=:id";
 $vCampos = array('titulo'=>$titulo, 'doc1'=>$doc1, 'doc2'=>$doc2, 'id'=>$id);
 $DB->Execute($sql, $vCampos);

 // Se Upload for só o doc2 ------------------------------------------------------------------------------------------------------------------------------------------//
 } elseif ($doc1 <> "" and $doc2 == "") {
 $doc2= $_FILES['doc2']['name'];
 $upload_file2 = $upload_dir . $_FILES['doc2']['name'];
 move_uploaded_file($_FILES['doc2']['tmp_name'], $upload_file2);

 $sql = "UPDATE tb_documentos SET titulo=:titulo, doc1=:doc1, doc2=:doc2, WHERE id=:id";
 $vCampos = array('titulo'=>$titulo, 'doc1'=>$doc1, 'doc2'=>$doc2, 'id'=>$id);
 $DB->Execute($sql, $vCampos);

 // Se Upload for doc1 e doc2 ------------------------------------------------------------------------------------------------------------------------------------------//
 } elseif ($doc1 == "" and $doc2 == "") {
 $doc1= $_FILES['doc1']['name'];
 $doc2= $_FILES['doc2']['name'];
 $upload_file1 = $upload_dir . $_FILES['doc1']['name'];
 $upload_file2 = $upload_dir . $_FILES['doc2']['name'];
 move_uploaded_file($_FILES['doc1']['tmp_name'], $upload_file1);
 move_uploaded_file($_FILES['doc2']['tmp_name'], $upload_file2);

 $sql = "UPDATE tb_documentos SET titulo=:titulo, doc1=:doc1, doc2=:doc2, WHERE id=:id";
 $vCampos = array('titulo'=>$titulo, 'doc1'=>$doc1, 'doc2'=>$doc2, 'id'=>$id);
 $DB->Execute($sql, $vCampos);

 } else {

 // Se não tiver Upload de doc1 e doc2 ------------------------------------------------------------------------------------------------------------------------------------------//

 $sql = "UPDATE tb_documentos SET titulo=:titulo, doc1=:doc1, doc2=:doc2, WHERE id=:id";
 $vCampos = array('titulo'=>$titulo, 'doc1'=>$doc1, 'doc2'=>$doc2, 'id'=>$id);
 $DB->Execute($sql, $vCampos);

 }

 header("location:./");
 exit;
	break;
?>