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<?php class X { public $a; public ?int $b = 1; function clean() { unset($this->a); unset($this->b); } } $x = new X; $x->clean(); var_dump($x->a); var_dump($x->b); ?>
Output for 8.1.32 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.21, 8.5.0 - 8.5.7
Warning: Undefined property: X::$a in /in/SU2SE on line 16 NULL Fatal error: Uncaught Error: Typed property X::$b must not be accessed before initialization in /in/SU2SE:17 Stack trace: #0 {main} thrown in /in/SU2SE on line 17
Process exited with code 255.
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