Pro PHP- Patterns, Frameworks, Testing and More

CHAPTER 12 ■ SPL ARRAY OVERLOADING^187

parent::__construct(&$this->_values);

}

public function offsetSet($key, $value) {

$this->_keys[spl_object_hash($key)] = $key;

$this->_values[spl_object_hash($key)] = $value;

}

public function offsetGet($key) {

return $this->_values[spl_object_hash($key)];

}

public function offsetExists($key) {

return array_key_exists(spl_object_hash($key), $this->_values);

}

public function offsetUnset($key) {

unset($this->_values[spl_object_hash($key)]);

}

public function getKey($hash) {

return $this->_keys[$hash];

}

}

$key = new KeyObject();

$collection = new CollectionObject();

$collection[$key] = 'test';

foreach($collection as $k => $v) {

print_r($collection->getKey($k));

print_r($v);

}

KeyObject Object

(

)

test

■Note When calling the parent ArrayIterator constructor, be sure to pass the $_values array as a

reference. This will ensure that future updates to the collection are reflected in the iterator.

McArthur_819-9C12.fm Page 187 Thursday, February 28, 2008 7:51 AM