#28344 [Fbk->NoF]: Memory/Stack or mktime() problem

ID: 28344 Updated by: php-bugs@lists.php.net Reported By: powerstat at web dot de -Status: Feedback +Status: No Feedback Bug Type: Date/time related Operating System: RedHat AS 2.1 IA64 PHP Version: 4.3.6 New Comment: No feedback was provided for this bug for over a week, so it is being suspended automatically. If you are able to provide the information that was originally requested, please do so and change the status of the bug back to "Open". Previous Comments: ------------------------------------------------------------------------ [2004-07-11 21:45:56] sniper@php.net Please try using this CVS snapshot: http://snaps.php.net/php4-STABLE-latest.tar.gz For Windows: http://snaps.php.net/win32/php4-win32-STABLE-latest.zip ------------------------------------------------------------------------ [2004-05-10 09:19:19] powerstat at web dot de Description: ------------ PHP has a function called mktime() (see http://www.php.net/manual/en/function.mktime.php) this uses internally the Unix/Linux mktime() function. We detected the problem within the phpGroupWare (actual cvs checkout from branch 0.9.16) www.phpgroupware.org cvs repositories: https://savannah.gnu.org/projects/phpgwapi and https://savannah.gnu.org/projects/phpgroupware/ The bug itself will occur in the following file: http://savannah.gnu.org/cgi-bin/viewcvs/phpgwapi/phpgwapi/inc/class.datetime.inc.php?rev=1.5.2.12.2.8&content-type=text/vnd.viewcvs-markup in the method function get_weekday_start($year,$month,$day) when php mktime() will be called, the result (in seconds) will be off by 2 days. This happens especially when zero or negative day values will be used. These values are allowed by php mktime() as well as by the underlying unix mktime() (see Itanium man mktime). We found that the problem only occurs in the above file, using the same values in a small test script will give backe the correct results! We assume that it might be a memory/stack problem within php itself, that we are not able to track down. Reproduce code: --------------- For URLs see description. switch($weekday) { case 0: $sday = mktime(2,0,0,$month,$day - 6,$year); break; case 1: $sday = mktime(2,0,0,$month,$day,$year); break; default: $sday = mktime(2,0,0,$month,$day - ($weekday - 1),$year); echo ':' . $day . ':' . $weekday . "<br />\n"; echo ':' . $year . '/' . $month . '/' . ($day - ($weekday - 1)) . ' : ' . $sday . ":<br /><hr />\n"; } Expected result: ---------------- The correct value in seconds (differs a bit by tomezone settings), but not values that are 2 days or more off. orrect Output values here 32bit linux machine: :1:4 :2004/4/-2 : 1080518400: :1:2 :2004/6/0 : 1085961600: :1:6 :2004/05/-4 : 1082937600: :1:6 :2004/05/-4 : 1082937600: wrong output values 64 bit itanium2: :1:4 :2004/4/-2 : 1080694800: :1:2 :2004/6/0 : 1085965200: :1:6 :2004/05/-4 : 1083286800: :1:6 :2004/05/-4 : 1083286800: ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=28344&edit=1