note 91483 added to function.usort

I recommend that you take special note of the fact that an INTEGER value must be returned from a sorting callback function. So, let's say you want to sort arrays by a quotient of two of their elements and to do so you write something like: <?php function sorter($a, $b) { return $a['num']/$a['denom'] - $b['num']/$b['denom']; } ?> You may not get the result you want because probably $x['num']/$x['denom'] has absolute value less than 1 and you'll get a lot of "same value" effective results from the comparator function as integer rounding occurs. To solve this just boost up the quotients to be big integers, then subtract them: <?php function sorter($a, $b) { return 1000*$a['num']/$a['denom'] - 1000*$b['num']/$b['denom']; } ?> ---- Server IP: 64.71.164.2 Probable Submitter: 70.231.134.116 ---- Manual Page -- http://www.php.net/manual/en/function.usort.php Edit -- https://master.php.net/note/edit/91483 Del: integrated -- https://master.php.net/note/delete/91483/integrated Del: useless -- https://master.php.net/note/delete/91483/useless Del: bad code -- https://master.php.net/note/delete/91483/bad+code Del: spam -- https://master.php.net/note/delete/91483/spam Del: non-english -- https://master.php.net/note/delete/91483/non-english Del: in docs -- https://master.php.net/note/delete/91483/in+docs Del: other reasons-- https://master.php.net/note/delete/91483 Reject -- https://master.php.net/note/reject/91483 Search -- https://master.php.net/manage/user-notes.php