Re: copy of object is not copy PHP4.0.4 serious BUG

There is a problem with deeply places references (often objects) not being full copy constructed but the reference is copied. In order to change the behavior we would have to do a deep copy *everytime* we copy a complex structure. This would be very bad performance wise so except for thinking about it I don't have a quick answer. You can most probably code around it (create a $a->clone() function which also copies the object inside). Andi At 07:20 PM 3/6/2001 +0100, Roland wrote:

Hello, consider following two classes:

    class TDynVars
    {
        var $vars;
        function set ($key, $val)
        {
            $this->vars[$key] = $val;
        }
    }

    class TRequest
    {
        var $eventData;
        function TRequest ()
        {
            $this->eventData = new TDynVars;
        }
    }

and two programs, A and B. program A:

    $r1 = new TRequest;
    $r1->eventData->vars[0]=1;
    $r2 = $r1;
    $r2->eventData->vars[0]=2;
    print($r1->eventData->vars[0]);

output of program A should be "1" and is "1", it is OK. program B:

    $r1 = new TRequest;
    $r1->eventData->set(0,1);
    $r2 = $r1;
    $r2->eventData->vars[0]=2;
    print($r1->eventData->vars[0]);

output of program B should be obviously "1" and is "2", it is NOT OK. Why $r2 changes data of $r1 if $r2 is $r1's copy by value not reference? Why this faulty behaviour is dependent on indirect access using member function use instead of direct acces? Note: The program B on PHP3.0.8 runs correctly, but not on PHP4.0.4. Thank you for solving this fundamental problem. Roland Divin -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, e-mail: php-dev-unsubscribe@lists.php.net For additional commands, e-mail: php-dev-help@lists.php.net To contact the list administrators, e-mail: php-list-admin@lists.php.net