#22988 [Fbk->Opn]: I'm feeling lucky - rand() bug

ID: 22988 User updated by: vakmajom at freemail dot hu Reported By: vakmajom at freemail dot hu -Status: Feedback +Status: Open Bug Type: Math related Operating System: Windows 2000 PHP Version: 4.3.2RC1 New Comment: The same case. Only even numbers. And a new rand() bug has also appeared: Without srand(microtime()*100000), always the same 10-20 numbers are returned. You should try this bug after the restart of Apache, to be sure that none of the php scripts called srand() before. Previous Comments: ------------------------------------------------------------------------ [2003-03-31 17:49:50] 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 ------------------------------------------------------------------------ [2003-03-31 15:22:49] pollita@php.net This is being caused by a carryover (2147483647 + 1 == -2147483648). The short answer is: "If it hurts, don't do it!" Of course that's not a proper answer. The API Macro could probably use some tweaking... ------------------------------------------------------------------------ [2003-03-31 12:36:52] vakmajom at freemail dot hu The function rand() always returns an even number! This bug appears when the parameters of rand() are near to the limits of int (i.e. 2147483647) Example: <?php echo(rand(1, 2147483647)); ?> Result: always an even number. I'm using Apache 2.0.44 with PHP4.3.2RC1 (original Win32 binary) as an apache module. Tests with different systems: Maybe this is a Windows bug, it still exists in Windows .Net server build 3718 with PHP 4.3.0 RC3 But everything is fine on a unix system with PHP 4.1.0 Strange... :)) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=22988&edit=1