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<?php class O implements ArrayAccess { public function offsetSet($key, $value) { $this->data[$key] = $value; } public function offsetExists($key) { return isset($this->data[$key]); } public function offsetUnset($key) { unset($this->data[$key]); } public function offsetGet($key) { return $this->data[$key]; } } $o = new O; $o['foo'] = 'bar'; var_dump(array_key_exists('foo', $o)); var_dump(array_key_exists('bar', $o)); $a = array(); $a['foo'] = 'bar'; var_dump(array_key_exists('foo', $a)); var_dump(array_key_exists('bar', $a));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of O::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/WuPaO on line 4 Deprecated: Return type of O::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/WuPaO on line 6 Deprecated: Return type of O::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/WuPaO on line 3 Deprecated: Return type of O::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/WuPaO on line 5 Deprecated: Creation of dynamic property O::$data is deprecated in /in/WuPaO on line 3 Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, O given in /in/WuPaO:11 Stack trace: #0 {main} thrown in /in/WuPaO on line 11
Process exited with code 255.

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