3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { private $untyped = 'old'; private string $typed = 'old'; public function clear() { unset($this->untyped); unset($this->typed); } public function reinitialise() { $this->typed = 'new'; $this->untyped = 'new'; } } $foo = new Foo; var_dump($foo); $foo->clear(); var_dump($foo); $foo->reinitialise(); var_dump($foo);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(Foo)#1 (2) { ["untyped":"Foo":private]=> string(3) "old" ["typed":"Foo":private]=> string(3) "old" } object(Foo)#1 (0) { ["typed":"Foo":private]=> uninitialized(string) } object(Foo)#1 (2) { ["untyped":"Foo":private]=> string(3) "new" ["typed":"Foo":private]=> string(3) "new" }
preferences:
126.9 ms | 403 KiB | 121 Q