From: adi at rogers dot com Operating system: Windows XP or Server 2003 PHP version: 5.1.2 PHP Bug Type: Math related Bug description: Mishandled type 'double' causes incorrect round() & number_format() output
Description: ------------ Very lame/unreliable ;) Both round() and number_format() succumb to this problem. They cannot handle float or double variables properly even though those variable types are "flawed / limited" as apparently described numerous times on here by PHP personnel. Well my code below appears to showcase the bug which will hopefully not be shot off as "bogus" like many times before as reported in the past by various people. I found a work-around which I will now be using. Convert your value to a string variable before passing it to the round() or number_format() function. Reproduce code: --------------- $num=12.5*1.15; // Produces 14.375 as type: double. $num_same_thing=14.375; // Produces 14.375 as type: double. echo "Wrong: ".round($num, 2)."\r\n"; echo "Wrong: ".number_format($num, 2)."\r\n"; echo "'Magically' correct: ".round($num_same_thing, 2)."\r\n"; echo "'Magically' correct: ".number_format($num_same_thing, 2)."\r\n"; // The above two variables are the same value and same type, yet are rounded differently. settype($num, "string"); // Now that $num is a string, we get the right result. echo "Converted to string and is now correct: ".round($num, 2)."\r\n"; echo "Converted to string and is now correct: ".number_format($num, 2)."\r\n"; Expected result: ---------------- The functions should have outputted 14.38 no matter how the variables of type 'double' were assigned the value 14.375. -- Edit bug report at http://bugs.php.net/?id=36008&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=36008&r=trysnapshot44 Try a CVS snapshot (PHP 5.1): http://bugs.php.net/fix.php?id=36008&r=trysnapshot51 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=36008&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=36008&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=36008&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=36008&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=36008&r=needscript Try newer version: http://bugs.php.net/fix.php?id=36008&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=36008&r=support Expected behavior: http://bugs.php.net/fix.php?id=36008&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=36008&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=36008&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=36008&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=36008&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=36008&r=dst IIS Stability: http://bugs.php.net/fix.php?id=36008&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=36008&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=36008&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=36008&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=36008&r=mysqlcfg
