Online PHP editor | refs for auAaP

<?php class ArrayObjectChild extends ArrayObject { public function offsetExists($offset) { var_dump('Called: '.__METHOD__); return parent::offsetExists($offset); } public function offsetGet($offset) { var_dump('Called: '.__METHOD__); return parent::offsetGet($offset); } } class ArrayAcessImplementation implements ArrayAccess { private $_array = array(); public function __construct(array $array) { $this->_array = $array; } public function offsetExists($offset) { var_dump('Called: '.__METHOD__); return array_key_exists($offset, $this->_array); } public function offsetGet($offset) { var_dump('Called: '.__METHOD__); return $this->_array[$offset]; } public function offsetSet($offset, $value) {} public function offsetUnset($offset) {} } $array = array('foo' => ''); echo "ArrayObject: empty string is set, but empty:\n"; $object = new ArrayObject($array); var_dump(isset($object['foo']), empty($object['foo'])); echo "ArrayObject extended: empty string is set, but not empty\n"; $object = new ArrayObjectChild($array); var_dump($object['foo'], isset($object['foo']), empty($object['foo'])); echo "ArrayAccess implemented: empty string is set, but empty\n"; $object = new ArrayAcessImplementation($array); var_dump(isset($object['foo']), empty($object['foo']));