note 57711 added to function.mt-srand

For security sensitive applications, a single call to microtime() is unlikely to provide sufficient randomness for the seed (even in combination with the process ID). If you are running a website a good way to rack up sufficient randomness is to maintain a seed which is updated everytime a webpage is served to any user. An example of such an update is: <?php $newseed = hash($oldseed.microtime()); ?> The use of a suitable hash, such as SHA2 will ensure that an attacker would have to guess the exact time at which every page was served to reconstruct the seed. This will quickly become infeasible as the number of pages served increases. (Nb. For the interested, I've written a bit more about this method here: http://dmossop.zeeblo.com/?p=35 ). ---- Manual Page -- http://www.php.net/manual/en/function.mt-srand.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+57711 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+57711&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+57711&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+57711&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+57711&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+57711&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+57711&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+57711&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+57711&report=yes Search -- http://master.php.net/manage/user-notes.php