#24630 [Opn->Bgs]: extract with EXTR_REFS makes weird references

ID: 24630 Updated by: sniper@php.net Reported By: tater at potatoe dot com -Status: Open +Status: Bogus Bug Type: Zend Engine 2 problem Operating System: OS X 10.2 PHP Version: 5.0.0b2-dev New Comment: Try search the bug database before submitting new reports.. there are couple of related reports still open. (mostly documentation issues..) Previous Comments: ------------------------------------------------------------------------ [2003-07-12 20:47:59] tater at potatoe dot com Description: ------------ If you create an array by assigning its elements the value of a scalar variable (or, in PHP5, by using array_combine() with an array of keys and an array built with array_fill() or array_pad()), then extract(array, EXTR_REFS) will make that scalar into a reference, as well as making all the array elements references to the same... location? I don't know, they all end up pointing to the same thing, so that changing any one of them changes all of them. This tests the same on the current PHP4 release and the latest CVS PHP5 code. Reproduce code: --------------- <?php function trap() { $tick = 0; $x = array('x1'=>$tick, 'x2'=>$tick, 'x3'=>0, 'x4'=>0); $y = array('y1'=>$tick, 'y2'=>$tick, 'y3'=>0, 'y4'=>0); var_dump(get_defined_vars()); foreach ($x as $k => $v) $$k =& $x[$k]; extract($y, EXTR_REFS); var_dump(get_defined_vars()); $x1 = 1; $y1 = 2; $y3 = 4; var_dump(get_defined_vars()); $tick = 5; var_dump(get_defined_vars()); } trap(); ?> Expected result: ---------------- Changing $y1 should only change it and y['y1']. Changing $tick should only change $tick. Actual result: -------------- Changing $y1 or $tick changes the other as well. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=24630&edit=1