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run code in 300+ PHP versions simultaneously
<?php class C implements Serializable { public function __serialize() { return []; } public function __unserialize(array $data) {} public function serialize() { return serialize( [] ); } public function unserialize( $serialized ) { $data = unserialize( $serialized ); } } 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(C)#1 (0) { }

preferences:
121.76 ms | 402 KiB | 121 Q