note 50289 added to function.number-format

While trying to add variables whose values had been processed with number_format() I found an interesting gotcha. Perhaps this might help others. Since number_format() returns a string, numbers returned that DO NOT have a comma in them will still be added but numbers that DO have a comma will not be added because PHP considers them a string and ignores them. e.g. #1 $quant_mag = 1; $cost_mag = 100; $quant_ffr = 1 $cost_ffr = 100; $ext_mag = number_format($quant_mag * $cost_mag,2); $ext_ffr = number_format($quant_ffr * $cost_ffr,2); $total_cost = $ext_mag + $ext_ffr; // $total cost is: 200 e.g. #2 $quant_mag = 10; $cost_mag = 100; $quant_ffr = 1 $cost_ffr = 100; $ext_mag = number_format($quant_mag * $cost_mag,2); $ext_ffr = number_format($quant_ffr * $cost_ffr,2); $total_cost = $ext_mag + $ext_ffr; // $total cost is: 100 (not 1100 as you would expect) because $ext_mag is ignored because php interprets its value (1,000) as a string so it won't add it to $ext_ffr. ---- Manual Page -- http://www.php.net/manual/en/function.number-format.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+50289 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+50289&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+50289&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+50289&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+50289&report=yes&reason=useless Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+50289&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+50289&report=yes Search -- http://master.php.net/manage/user-notes.php