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<?php class C { public function __serialize() { return []; } public function __unserialize(array $data) {} } var_dump(unserialize('C:1:"C":6:{a:0:{}}'));
Output for 7.4.0 - 7.4.33, 8.0.1 - 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, 8.5.0 - 8.5.3
Warning: Class C has no unserializer in /in/WHBN2 on line 8 object(C)#1 (0) { }

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