#44223 [NEW]: round() sometimes (chaotically?) returns a value in E notation

From: kjohnson at zootweb dot com Operating system: Linux 2.6.20.2 PHP version: 5.2.5 PHP Bug Type: Math related Bug description: round() sometimes (chaotically?) returns a value in E notation Description: ------------ For certain values, not necessarily large numbers, round() returns the value in exponential notation instead of the usual decimal format. Some of these "special" values are 1200000, 1400000, 2300000, 2400000. It seems to be just certain multiples of 100,000. Generate your own list with the code below. I suggest you start with input of: Start = 1000000 Increment = 100000 Iterations = 100 to 200 Reproduce code: --------------- <html><head><title></title></head><body> <form method="post" action="<?=$_SERVER['PHP_SELF']?>"> <!-- some recommended values for next fields: 1000000, 100000, 200 --> Start value:<input type="text" name="start"> &nbsp;&nbsp; Increment: <input type="text" name="increment"> &nbsp;&nbsp; Iterations: <input type="text" name="iterations"> <input type="submit"> </form> <? if(count($_POST)) { echo "<p>Start: ", $_POST['start'], "; Increment: ", $_POST['increment'], "</p>"; $tmp = $_POST['start']; echo round($tmp),"<br>"; for($i = 0; $i < $_POST['iterations']; $i++ ) { $tmp += $_POST['increment']; echo round($tmp),"<br>"; } } ?> </body></html> Expected result: ---------------- All values to be returned in standard decimal format, e.g., "1200000". Actual result: -------------- Certain values are returned in exponential format, e.g., "1.2E+6". -- Edit bug report at http://bugs.php.net/?id=44223&edit=1 -- Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=44223&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=44223&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=44223&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=44223&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=44223&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=44223&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=44223&r=needscript Try newer version: http://bugs.php.net/fix.php?id=44223&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=44223&r=support Expected behavior: http://bugs.php.net/fix.php?id=44223&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=44223&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=44223&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=44223&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=44223&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=44223&r=dst IIS Stability: http://bugs.php.net/fix.php?id=44223&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=44223&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=44223&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=44223&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=44223&r=mysqlcfg