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<?php class obj { var $prop; function __wakeup() { unset($this->prop); } } var_dump(unserialize('a:2:{i:0;O:3:"obj":1:{s:4:"prop";R:2;}i:1;i:3;}'));
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(2) { [0]=> object(obj)#1 (0) { } [1]=> int(3) }

preferences:
242.61 ms | 404 KiB | 369 Q