From: salsi at icosaedro dot it Operating system: PHP version: 5.3.0 PHP Bug Type: *General Issues Bug description: (float) "NAN" gives float(0.0) rather than float(NAN)
Description: ------------ The (float) typecast operator applied to a string is expected to return the floating point number represented by the string, instead the special values "NAN", "INF" and "-INF" are not handled properly and give 0.0, 0.0 and -0.0 respectively. To make the (float) operator applied to a string symmetrical versus the (string) operator applied to a float, the special strings "NAN", "INF" and "-INF" case sensitive should be translated into NAN, INF and -INF respectively: $f = NAN; $s = (string) $f; # ==> "NAN" $g = (float) $s; # ==> NAN again Apparently the serialize/unserialize process works properly as it was fixed in bug #27646: var_dump( unserialize(serialize(NAN)) ) ==> float(NAN) Reproduce code: --------------- var_dump( (float) "INF" ); # expected float(INF) var_dump( (float) "-INF" ); # expected float(-INF) var_dump( (float) "NAN" ); # expected float(NAN) Expected result: ---------------- float(INF) float(-INF) float(NAN) Actual result: -------------- float(0) float(-0) float(0) -- Edit bug report at http://bugs.php.net/?id=48968&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=48968&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=48968&r=trysnapshot53 Try a snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=48968&r=trysnapshot60 Fixed in SVN: http://bugs.php.net/fix.php?id=48968&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=48968&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=48968&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=48968&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=48968&r=needscript Try newer version: http://bugs.php.net/fix.php?id=48968&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=48968&r=support Expected behavior: http://bugs.php.net/fix.php?id=48968&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=48968&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=48968&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=48968&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=48968&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=48968&r=dst IIS Stability: http://bugs.php.net/fix.php?id=48968&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=48968&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=48968&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=48968&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=48968&r=mysqlcfg
