note 68512 added to ref.errorfunc

What it is unknown error code 4096?
I get this code when try do this code
class a {}
function b() { return new a; }
echo b();

// Object of class a could not be converted to string
----
Server IP: 66.163.161.117
Probable Submitter: 62.219.160.28
----
X-Spam-Status: No, hits=3.1 required=5.0
tests=DATE_MISSING,FROM_NO_LOWER 
	autolearn=no version=2.64
----
Manual Page -- http:/
/www.php.net/manual/en/ref.errorfunc.php
Edit        -- https://master
.php.net/note/edit/68512
Del: integrated  -- h
ttps://master.php.net/note/delete/68512/integrated
Del: useless     -- http
s://master.php.net/note/delete/68512/useless
Del: bad code    -- htt
ps://master.php.net/note/delete/68512/bad+code
Del: spam        -- https:/
/master.php.net/note/delete/68512/spam
Del: non-english -- 
https://master.php.net/note/delete/68512/non-english
Del: in docs     -- http
s://master.php.net/note/delete/68512/in+docs
Del: other reasons-- https://mast
er.php.net/note/delete/68512
Reject      -- https://mast
er.php.net/note/reject/68512
Search      -- https://
master.php.net/manage/user-notes.php

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Note Submitter: dima at snaiper dot net 

----

What it is unknown error code 4096?
I get this code when try do this code
class a {}
function b() { return new a; }
echo b();

// Object of class a could not be converted to string

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