Bug #75831 [NEW]: Coalesce operator ?? never uses the default isset() handler

From: nobots dot nospam at example dot org Operating system: PHP version: 7.2.1 Package: *General Issues Bug Type: Bug Bug description:Coalesce operator ?? never uses the default isset() handler Description: ------------ The coalesce operator calls __get(prop) directly without testing isset($obj->prop) first. It only calls isset($obj->prop) if there is an explicit user-defined __isset() handler. Test script: --------------- class Bar{ function __get($a){ throw new Error("no prop error\n"); } } $bar = new Bar; try{ var_dump($bar->foo ?? "qux"); // error... } catch(Throwable $e){ echo $e->getMessage(); } var_dump(isset($bar->foo)); // ...but this works fine Expected result: ---------------- class Bar{ function __isset($a){ return isset($this->{$a}); // I shouldn't be forced to implement this, // since it looks exactly like the default isset() handler } function __get($a){ throw new Error("no prop error\n"); } } $bar = new Bar; var_dump($bar->foo ?? "qux"); // works now, without errors... -- Edit bug report at https://bugs.php.net/bug.php?id=75831&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75831&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75831&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75831&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75831&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75831&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75831&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75831&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75831&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75831&r=support Expected behavior: https://bugs.php.net/fix.php?id=75831&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75831&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75831&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75831&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75831&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75831&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75831&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75831&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75831&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75831&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75831&r=mysqlcfg