note 106270 added to function.array-rand

Please note that when $num_req is constant and $num_req << count($input), this function is O(count($input)), which is not really cool. In this cases you can implement your own function, that takes one random key each time and puts in the new array, each time make sure that the key wasn't picked earlier. Using PHP arrays when $num_req << count($input) it is O($num_req^2). We can achieve O($num_req log($num_req)) using self balancing trees, but for practical PHP applications that would be an overkill and probably give even worse results. @Sebmil seems to be just fine on PHP 5.3.5 on windows 7 64-bit. ---- Server IP: 69.147.83.197 Probable Submitter: 84.229.10.246 ---- Manual Page -- http://www.php.net/manual/en/function.array-rand.php Edit -- https://master.php.net/note/edit/106270 Del: integrated -- https://master.php.net/note/delete/106270/integrated Del: useless -- https://master.php.net/note/delete/106270/useless Del: bad code -- https://master.php.net/note/delete/106270/bad+code Del: spam -- https://master.php.net/note/delete/106270/spam Del: non-english -- https://master.php.net/note/delete/106270/non-english Del: in docs -- https://master.php.net/note/delete/106270/in+docs Del: other reasons-- https://master.php.net/note/delete/106270 Reject -- https://master.php.net/note/reject/106270 Search -- https://master.php.net/manage/user-notes.php