Bug #78443 [NEW]: Trying to create own isset/notempty function creates keys by ref

From: 6562680 at gmail dot com Operating system: Win10 PHP version: 7.2.21 Package: Scripting Engine problem Bug Type: Bug Bug description:Trying to create own isset/notempty function creates keys by ref Description: ------------ When you pass undefined key by reference, the key will be created and filled with null value. So you need manually remove these key or choose not to write own isset functions. As an attention, you cannot remove these key inside function you pass key, you should unset it manually at same level you calling own isset. Test script: --------------- <?php // declare function notempty(&$test, &$result = null) { if (! (is_null($test) || ('' === $test) || (is_float($test) && is_nan($test)) )) { $result = $test; } return isset($result); } // run $arr = [0]; if (notempty($arr[1], $result)) dosomething($result); var_dump($arr); // wtf, [0,null] Expected result: ---------------- Auto remove created keys or just really "check" keys before create it... Not sure its possible in C -- Edit bug report at https://bugs.php.net/bug.php?id=78443&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=78443&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78443&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78443&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78443&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78443&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78443&r=support Expected behavior: https://bugs.php.net/fix.php?id=78443&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78443&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78443&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78443&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=78443&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=78443&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78443&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78443&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78443&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78443&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78443&r=mysqlcfg