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<?php class foo implements ArrayAccess { private $container = array(); public function __construct() { $this->container = array(); } public function offsetSet($offset, $value) { if (is_null($offset)) { $this->container[] = $value; } else { $this->container[$offset] = $value; } } public function offsetExists($offset) { return isset($this->container[$offset]); } public function offsetUnset($offset) { unset($this->container[$offset]); } public function offsetGet($offset) { return isset($this->container[$offset]) ? $this->container[$offset] : null; } } $foo = new foo(); $foo['bar'] = 1; var_dump(array_key_exists('bar', $foo));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of foo::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Cl2ri on line 15 Deprecated: Return type of foo::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Cl2ri on line 21 Deprecated: Return type of foo::offsetSet($offset, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Cl2ri on line 8 Deprecated: Return type of foo::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Cl2ri on line 18 Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, foo given in /in/Cl2ri:28 Stack trace: #0 {main} thrown in /in/Cl2ri on line 28
Process exited with code 255.

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