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<?php class C implements ArrayAccess { public $data = array( "foo" => null ); public function offsetExists($offset): bool { return array_key_exists((string)$offset, $this->data); } public function offsetGet($offset) { return $this->data[$offset]; } public function offsetSet($offset, $value): void { $this->data[$offset] = $value; } public function offsetUnset($offset): void { unset($this->data[$offset]); } } $o = new C(); var_dump(isset($o['foo'])); var_dump(property_exists($o, 'foo')); var_dump(array_key_exists('foo', $o)); var_dump(array_key_exists('foo', ['foo' => null]));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of C::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/heZmC on line 12 bool(true) bool(false) Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, C given in /in/heZmC:30 Stack trace: #0 {main} thrown in /in/heZmC on line 30
Process exited with code 255.

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