3v4l.org

run code in 500+ PHP versions simultaneously
<?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); ?>

preferences:
60.77 ms | 890 KiB | 5 Q