Bug #51739 [NEW]: tricky string to float conversion

From: Operating system: PHP version: 5.2.13 Package: *General Issues Bug Type: Bug Bug description:tricky string to float conversion Description: ------------ If you convert a string like 8315e839da08e2a7afe6dd12ec58245d into a float the conversion results in float(INF). The conversion seems to use only 8315e839 and throws anything else away. $ php -r 'var_dump(time()+rand()+"8315e839da08e2a7afe6dd12ec58245d");' float(INF) Converting this string into a float is - of course - a bug of my PHP script. But at least I would like to discuss about the conversion behavior. It is fully correct to convert this string into a float if it is just "8315e839" but throwing some data away is - from my point of view - not a valid behavior. Test script: --------------- var_dump((float)"8315e839da08e2a7afe6dd12ec58245d"); Expected result: ---------------- false or null or some other invalid "floats" or a warning Actual result: -------------- float(INF) -- Edit bug report at http://bugs.php.net/bug.php?id=51739&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=51739&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=51739&r=trysnapshot53 Try a snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=51739&r=trysnapshot60 Fixed in SVN: http://bugs.php.net/fix.php?id=51739&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=51739&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=51739&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=51739&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=51739&r=needscript Try newer version: http://bugs.php.net/fix.php?id=51739&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=51739&r=support Expected behavior: http://bugs.php.net/fix.php?id=51739&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=51739&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=51739&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=51739&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=51739&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=51739&r=dst IIS Stability: http://bugs.php.net/fix.php?id=51739&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=51739&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=51739&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=51739&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=51739&r=mysqlcfg