note 126609 added to function.gmp-popcount

Another way to get the population count when you don't have the gmp extension is using bitwise operations: <?php $int = 133; // 10000101 for($count = 0; $int != 0; $count++) // repeat until $int is 0 (and count the amount of steps it takes in $count) { $int = $int & $int-1; // remove the right most 1 from $int using the bitwise and operator } echo $count; // 3 ?> This is Kernighan's population count. https://youtu.be/ZRNO-ewsNcQ?t=510 has a nice explanation on how it works ---- Server IP: 45.112.84.4 Probable Submitter: 45.112.85.242 (proxied: 2a02:a465:b370:1:993a:57ec:2bc5:7b3d) ---- Manual Page -- https://php.net/manual/en/function.gmp-popcount.php Edit -- https://main.php.net/note/edit/126609 Del: integrated -- https://main.php.net/note/delete/126609/integrated Del: useless -- https://main.php.net/note/delete/126609/useless Del: bad code -- https://main.php.net/note/delete/126609/bad+code Del: spam -- https://main.php.net/note/delete/126609/spam Del: non-english -- https://main.php.net/note/delete/126609/non-english Del: in docs -- https://main.php.net/note/delete/126609/in+docs Del: other reasons-- https://main.php.net/note/delete/126609 Reject -- https://main.php.net/note/reject/126609 Search -- https://main.php.net/manage/user-notes.php