3v4l.org

run code in 500+ PHP versions simultaneously
<?php class A { public array $foo = ['baz' => 10]; public int $bar { get => $this->foo['baz']; set { $this->foo['baz'] = $value; } } public function __sleep() { return array_keys(get_object_vars($this)); } } $a = new A; $a->bar = 20; var_dump(unserialize(serialize($a))->bar); // var_dump(get_object_vars(new A()));
Output for 8.4.3
Warning: serialize(): "bar" returned as member variable from __sleep() but does not exist in /in/V1S5i on line 22 int(20)
Output for 8.3.5
Parse error: syntax error, unexpected token "{", expecting "," or ";" in /in/V1S5i on line 6
Process exited with code 255.
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