Bug #61188 [NEW]: Assignment changes order of evaluation of binop expression

From: Operating system: linux PHP version: 5.3.10 Package: Variables related Bug Type: Bug Bug description:Assignment changes order of evaluation of binop expression Description: ------------ An assignment expression can change the order of operation for == and != (and possibly other binops) Test script: --------------- <?php $a = 3; var_dump( $a == ( $a = 4 ) ); Expected result: ---------------- bool(false) evaluation of $a == ( $a = 4 ) should be as follows: left side of the comparison is evaluated (evaluates to 3) right side of the comparison is evaluated (4 is assigned to $a, evaluates to 4) 3 == 4 finally evaluates to false Actual result: -------------- bool(true) -- Edit bug report at https://bugs.php.net/bug.php?id=61188&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=61188&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=61188&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=61188&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=61188&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=61188&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=61188&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=61188&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=61188&r=needscript Try newer version: https://bugs.php.net/fix.php?id=61188&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=61188&r=support Expected behavior: https://bugs.php.net/fix.php?id=61188&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=61188&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=61188&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=61188&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=61188&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=61188&r=dst IIS Stability: https://bugs.php.net/fix.php?id=61188&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=61188&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=61188&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=61188&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=61188&r=mysqlcfg