Description:
------------
Possibly,it`s a duplicate bug of
 Bug #25128  	set_error_handler not sending reference
http://bugs.php.net/bug.php?id=25128&edit=2

I tried to write my own class for handling errors in php and
found that if i call set_error_handler with argument, being
object(&$this), it is passed by value, not by reference.

This is strange, because function set_error_handler is
declared same as call_user_func, but behaves differently.

as defined in manual:
mixed call_user_func ( callback function...)
mixed set_error_handler ( callback error_handler...)

I tested example on FreeBSD 4.1/PHP 4.3.10 and Linux 2.4.25/PHP 4.3.5

Code,demonstrating this, provided below.

P.S. If it`s a duplication, then you can mean this report as BUG IN DOCUMENTATION! I found that i wanted to do almost the same as man in Bug #25128, but due to lack of documentation, spent a lot of time for nothing...


Reproduce code:
---------------
<?php
class error_handler
{	var $error_count;
	function error_handler(){
		$this->error_count=0;
		set_error_handler(array(&$this,'handler'));
		echo "<b>New error handler registered!</b><br>";
	}
	function handler()
	{
		echo "Cought an error! increasing counter!<br>";
		$this->error_count++;}
	function show(){
		echo "This object handled ".$this->error_count." errors<br>";
	}
}

$x=new error_handler;

$x->show();

trigger_error("Ooops!",E_USER_ERROR);
$x->show();
trigger_error("Ooops!",E_USER_ERROR);
$x->show();
echo "<b>called by call_user_func:</b><br>";
call_user_func(array(&$x, "handler"));
$x->show();
echo "<b>called manually</b><br>";
$x->handler();
$x->show();

?>

Expected result:
----------------
New error handler registered!
This object handled 0 errors
Cought an error! increasing counter!
This object handled 1 errors
Cought an error! increasing counter!
This object handled 2 errors
called by call_user_func:
Cought an error! increasing counter!
This object handled 3 errors
called manually
Cought an error! increasing counter!
This object handled 4 errors

Actual result:
--------------
New error handler registered!
This object handled 0 errors
Cought an error! increasing counter!
This object handled 0 errors
Cought an error! increasing counter!
This object handled 0 errors
called by call_user_func:
Cought an error! increasing counter!
This object handled 1 errors
called manually
Cought an error! increasing counter!
This object handled 2 errors