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<?php class A { protected $_sqlStatements = []; public function __sleep() { return ['_sqlStatements']; } } class B extends A {} var_dump(serialize(new B));
Output for 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
string(43) "O:1:"B":1:{s:17:"*_sqlStatements";a:0:{}}"

preferences:
66.14 ms | 1107 KiB | 4 Q