Online PHP editor | refs for gYeCM

<?php class App_Collection implements ArrayAccess, IteratorAggregate, Countable { public $data = array(); public function count() { return count($this->data); } public function offsetExists($offset) { return (isset($this->data[$offset])); } public function offsetGet($offset) { if ($this->offsetExists($offset)) { return $this->data[$offset]; } return false; } public function offsetSet($offset, $value) { if ($offset) { $this->data[$offset] = $value; } else { $this->data[] = $value; } } public function offsetUnset($offset) { unset($this->data[$offset]); } public function getIterator() { return new ArrayIterator($this->data); } } echo "ArrayAccess:\n"; $collection = new App_Collection(); $collection['foo'] = 'bar'; var_dump(array_key_exists('foo', $collection)); echo "ArrayObject:\n"; $collection = new ArrayObject(); $collection['foo'] = 'bar'; var_dump(array_key_exists('foo', $collection));