#41905 [NEW]: Incorrect String Compare with '=='

From: domluc at gmail dot com Operating system: GNU/Linux Debian PHP version: 4.4.7 PHP Bug Type: Strings related Bug description: Incorrect String Compare with '==' Description: ------------ Obs:This bug hape in PHP 4.4.x and 5.2.x I have a string with 17bytes, sample: <code> $var1 = '99990000000650719'; $var2 = '99990000000650718'; </code> if I compare these strings with: <code> if ( $var1 == $var2) echo "Equal" else echo 'Not Equal' </code> it will print Equal, but this is incorrect. The solution to correct do this, is using '===': $var1 === $var2 But this behavior is wrong. I beliave that when php engine compare with '==' it cast variables to integer, and 17th byte is ignored! -- Edit bug report at http://bugs.php.net/?id=41905&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=41905&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=41905&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=41905&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=41905&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=41905&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=41905&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=41905&r=needscript Try newer version: http://bugs.php.net/fix.php?id=41905&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=41905&r=support Expected behavior: http://bugs.php.net/fix.php?id=41905&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=41905&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=41905&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=41905&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=41905&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=41905&r=dst IIS Stability: http://bugs.php.net/fix.php?id=41905&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=41905&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=41905&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=41905&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=41905&r=mysqlcfg