Bug #12455 Updated: Srand and shuffle give odd results

ID: 12455 User updated by: sulka@sulake.com Reported By: sulka@sulake.com Status: Open Bug Type: *Math Functions Operating System: SunOS 5.8 (Solaris) PHP Version: 4.0.4pl1 New Comment: Well, when I run that code I get 4, not 500. Upping the number of iterations doesn't help. I think the problem is with the particular build (extension/OS combination). Any way to debug this? Previous Comments: ------------------------------------------------------------------------ [2001-07-29 14:26:39] rasmus@php.net I don't think I understand what the problem is here. I tested your code with the following: <? function pwd() { $password = ""; $array = array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',0,1,2,4,5,6,7,8,9); srand ((double)microtime()*1000000); shuffle(&$array); for ($i=0; $i<6; $i++) { $password .= $array[$i]; } return $password; } $i=0; while($i<500) { $password = pwd(); $a[$password] = $password; $i++; } echo count($a); ?> This always returns 500 which means that 500 unique passwords were always created. ------------------------------------------------------------------------ [2001-07-29 05:51:30] sulka@sulake.com I'm using the following code to create random strings (passwords): $password = ""; $array = array('a','b','c','d','e','f','g','h','i','j','k','l','m',' n','o','p','q','r','s','t','u','v','w','x','y','z',0,1,2,4, 5,6,7,8,9); srand ((double)microtime()*1000000); shuffle(&$array); for ($i=0; $i<6; $i++) { $password .= $array[$i]; } Now, for some reason this seems to return only five different values ever on the Solaris machine I'm running the code on. And I'm not checking on the same run of the script, this is based on accessing page with the script through http and looking at the results for about 150 reloads on two different days. This is the first time I'm sending a PHP report so I don't know exactly what information to provide. Please ask for more if as you see fit. ------------------------------------------------------------------------ Edit this bug report at http://bugs.php.net/?id=12455&edit=1