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<?php declare(strict_types=1); class A { public static function __set_state(): object { return new self; } } $a = new A; eval('$b = ' . var_export($a, true) . ';'); var_dump($b); ?>
Output for 8.5.0 - 8.5.3
Fatal error: Method A::__set_state() must take exactly 1 argument in /in/tIHi3 on line 5 Stack trace: #0 {main}
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18
Fatal error: Method A::__set_state() must take exactly 1 argument in /in/tIHi3 on line 5
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
object(A)#2 (0) { }

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