note 62583 added to ref.math

A function that simulates the sum operator. (http://en.wikipedia.org/wiki/Sum). Be careful with the expression because it may cause a security hole; note the single quotes to don't parse the "$". <?php # @param string $expr expression to evaluate (for example (2*$x)^2+1) # @param string $var dummy variable (for example "x") # @param integer $start # @param integer $end # @param integer $step function sum($expr,$var,$start,$end,$step = 1) { $expr = str_replace(';','',$expr); $var = str_replace('$','',$var); $start = (int)$start; $end = (int)$end; $step = (int)$step; $sum = 0; for ($i = $start; $i <= $end; $i = $i + $step) { $_expr = str_replace('$'.$var,$i,$expr); $_eval = '$_result = '.$_expr.'; return $_result;'; $_result = eval($_eval); if($result === FALSE) return "SYNTAX ERROR : $expr"; $sum += $_result; } return (int)$sum; } ?> ---- Server IP: 194.153.94.11 Probable Submitter: 83.79.103.119 ---- X-Spam-Status: No, hits=3.1 required=5.0 tests=DATE_MISSING,FROM_NO_LOWER autolearn=no version=2.64 ---- Manual Page -- http://www.php.net/manual/en/ref.math.php Edit -- http://master.php.net/note/edit/62583 Del: integrated -- http://master.php.net/note/delete/62583/integrated Del: useless -- http://master.php.net/note/delete/62583/useless Del: bad code -- http://master.php.net/note/delete/62583/bad+code Del: spam -- http://master.php.net/note/delete/62583/spam Del: non-english -- http://master.php.net/note/delete/62583/non-english Del: in docs -- http://master.php.net/note/delete/62583/in+docs Del: other reasons-- http://master.php.net/note/delete/62583 Reject -- http://master.php.net/note/reject/62583 Search -- http://master.php.net/manage/user-notes.php