Description:
------------
call_user_func_array() seems to modifies the internal object context while used with set_error_handler();
See the reproduce code.

Note: In the reproduce code, when not using call_user_func_array() (direct function call), there is no problem and the expected behavior occurs.

Reproduce code:
---------------
<?php
class Foo
{
    public function call()
    {
        set_error_handler(array($this, '_errors'));
        $result = call_user_func_array('ucfirst', array());
    }
    
    protected function _errors($errno, $errstr)
    {
        throw new Exception($errstr);
    }
}

$f = new Foo;
$f->call();

Expected result:
----------------
Exception thrown with the message telling that ucfirst accept one parameter, none given

Actual result:
--------------
Fatal error: Call to protected method Foo::_errors() from context '' in /path/to/script.php on line XXX


PHP 5.3.0 returns :

Warning: Invalid callback Foo::_errors, cannot access protected method Foo::_errors() in /path/to/script.php on line XXX

Warning: ucfirst() expects exactly 1 parameter, 0 given in /path/to/script.php on line XXX