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<?php class O implements ArrayAccess { public function offsetSet($offset, $value) {} public function offsetExists($offset) { return true; } public function offsetUnset($offset) {} public function offsetGet($offset) { return true; } } $o = new O; var_dump(array_key_exists('foo', $o));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of O::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/nYuMO on line 4 Deprecated: Return type of O::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/nYuMO on line 6 Deprecated: Return type of O::offsetSet($offset, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/nYuMO on line 3 Deprecated: Return type of O::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/nYuMO on line 5 Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, O given in /in/nYuMO:10 Stack trace: #0 {main} thrown in /in/nYuMO on line 10
Process exited with code 255.

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