Bug #78744 [NEW]: Unexpected __set & __get behavior

From: dirk dot gerigk at tui dot com Operating system: Linux PHP version: 7.4.0RC4 Package: Class/Object related Bug Type: Bug Bug description:Unexpected __set & __get behavior Description: ------------ Issue is that __get and __set does some strange things when commenting in and out the $this->array = []; line. Test the code and you will see. This all started with "Typed Properties" and its is very strange. So, is this normal behavior? If yes, why is that so? Must Important Question: Why are the magic methods connected to the property definition and the error clearly says "X::$bar must be string, null used"? Because at this point the __get returns NULL. On a previous BUG Report (Bug #78226) someone sayed: Do always ?string $foo = null; But that can be the solution to this, or? Test script: --------------- class X { protected string $bar; protected array $array = []; public function __construct(string $bar) { $this->bar = $bar; $this->array = []; print $this->bar.PHP_EOL; } public function __set($name, $value) { print "set $name = $value".PHP_EOL; $this->array[$name] = $value; } public function __get($name) { print 'get '.$name.PHP_EOL; return $this->array[$name] ?? null; } } $obj = new X('FOO'); Expected result: ---------------- set bar = FOO get bar FOO Actual result: -------------- set bar = FOO get bar Fatal error: Uncaught TypeError: Typed property X::$bar must be string, null used -- Edit bug report at https://bugs.php.net/bug.php?id=78744&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=78744&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78744&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78744&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78744&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78744&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78744&r=support Expected behavior: https://bugs.php.net/fix.php?id=78744&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78744&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78744&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78744&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=78744&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=78744&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78744&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78744&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78744&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78744&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78744&r=mysqlcfg