#30394 [Ver->Csd]: Assignment operators yield wrong result with __get/__set

ID: 30394 Updated by: dmitry@php.net Reported By: php at hartwerk dot com -Status: Verified +Status: Closed Bug Type: Zend Engine 2 problem Operating System: Linux PHP Version: 5CVS-STABLE-03-23 New Comment: Fixed in PHP_5_0. This bug was already fixed in HEAD long time ago with new garbage collector. Previous Comments: ------------------------------------------------------------------------ [2005-03-23 22:51:34] tony2001@php.net With clean 5.0.x-CVS I get: 2 Fatal error: Unsupported operand types in index.php on line 23 with the code below. HEAD works just fine. ------------------------------------------------------------------------ [2004-11-04 16:10:03] tony2001@php.net It's 5.0.x specific bug. ------------------------------------------------------------------------ [2004-10-15 18:46:51] php at hartwerk dot com An easier work-around would be $c->a = $c->a + max( 0, 1 ), but work-arounds do not solve bugs.. ------------------------------------------------------------------------ [2004-10-15 12:13:47] ante dot dfg at moj dot net This code works if you return the value from _get via reference.... try: public function &__get( $what ) { return $this->_p[ $what ]; } ------------------------------------------------------------------------ [2004-10-11 11:24:19] php at hartwerk dot com Description: ------------ When there is a function on the right-hand side of an assignment operator expression, and the variable is to be accessed via __get/__set, the operation yields wrong results. Reproduce code: --------------- class Container { public function __get( $what ) { return $this->_p[ $what ]; } public function __set( $what, $value ) { $this->_p[ $what ] = $value; } private $_p = array(); } $c = new Container(); $c->a = 1; $c->a += 1; print $c->a; // --> 2 print " - "; $c->a += max( 0, 1 ); print $c->a; // --> 4 (!) Expected result: ---------------- 2 - 3 Actual result: -------------- 2 - 4 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=30394&edit=1