#49179 [NEW]: zero problem in if and switch

From: steve at ezd dot com Operating system: linux PHP version: 5.2.10 PHP Bug Type: *General Issues Bug description: zero problem in if and switch Description: ------------ please run source code, it's self explained it seems that when use 0 to compare with string, it returns true all the time, problem in if is when using ==, === has no problem in switch case, it matches the first non number case Reproduce code: --------------- if (0=="a") echo "this is ture."; $check=0; switch ($check) { case 'a': echo "this is a "; break; default : echo "no match"; } Expected result: ---------------- no match Actual result: -------------- this is ture.this is a -- Edit bug report at http://bugs.php.net/?id=49179&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=49179&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=49179&r=trysnapshot53 Try a snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=49179&r=trysnapshot60 Fixed in SVN: http://bugs.php.net/fix.php?id=49179&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=49179&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=49179&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=49179&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=49179&r=needscript Try newer version: http://bugs.php.net/fix.php?id=49179&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=49179&r=support Expected behavior: http://bugs.php.net/fix.php?id=49179&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=49179&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=49179&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=49179&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=49179&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=49179&r=dst IIS Stability: http://bugs.php.net/fix.php?id=49179&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=49179&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=49179&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=49179&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=49179&r=mysqlcfg