How to update via patch?

Question

linux

The bottom line is that I have folders with site versions on one server.
I get a diff from them,
diff -Naur v1 v2
I get a diff file, everything is fine. I start using it and nothing comes out.
patch < diff.diff
he swears

patching file index.php
Hunk #1 FAILED at 1.
1 out of 1 hunk FAILED -- saving rejects to file index.php.rej

I can't figure out what's wrong
here is an example file

diff -Naur v1/index.php v2/index.php
--- v1/index.php	2015-09-17 14:25:21.112513877 +0500
+++ v2/index.php	2015-09-17 14:25:35.140514257 +0500
@@ -1,3 +1,3 @@
-<?php_egg_logo_guid
+<?php
 
-dfdf
\ No newline at end of file
+echo 1;
\ No newline at end of file

Answer 1

and what did you write down in rezhekty? there it is written that it did not allow to apply the patch

Answer 2

the "p" parameter cuts the beginning of the path to the desired number
and do not forget to enter the root of the target directory