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<?php class A implements ArrayAccess { public function offsetSet($offset, $value): void { var_dump(__METHOD__); } public function offsetGet($offset): mixed {} public function offsetUnset($offset): void {} public function offsetExists($offset): bool {} } class B extends ArrayObject { public function offsetSet($offset, $value): void { var_dump(__METHOD__); } } $a = new A(); $a[] = 1; $b = new B(); $b[] = 1;
Output for git.master, git.master_jit, rfc.property-hooks
string(12) "A::offsetSet" string(12) "B::offsetSet"

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