#20673 [NEW]: Inexplicable arithmetical error due to references

From: dakota@dir.bg Operating system: Win 2000 NT PHP version: 4.2.1 PHP Bug Type: Scripting Engine problem Bug description: Inexplicable arithmetical error due to references <? $a = 7; $a = $a + $a++; echo $a; //the result is 14; ?> When I add a reference to $a, the behavior of $a + $a++ becomes inexplicable different. Note that $a isn't changed anywhere! <? $a = 7; $b =& $a; $a = $a + $a++; echo $a; //the result is 15; ?> The only difference is $b =& $a, but why $a takes care of references to itself? -- Edit bug report at http://bugs.php.net/?id=20673&edit=1 -- Try a CVS snapshot: http://bugs.php.net/fix.php?id=20673&r=trysnapshot Fixed in CVS: http://bugs.php.net/fix.php?id=20673&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=20673&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=20673&r=needtrace Try newer version: http://bugs.php.net/fix.php?id=20673&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=20673&r=support Expected behavior: http://bugs.php.net/fix.php?id=20673&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=20673&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=20673&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=20673&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=20673&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=20673&r=dst IIS Stability: http://bugs.php.net/fix.php?id=20673&r=isapi