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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\base;
/**
* ArrayAccessTrait provides the implementation for [[\IteratorAggregate]], [[\ArrayAccess]] and [[\Countable]].
*
* Note that ArrayAccessTrait requires the class using it contain a property named `data` which should be an array.
* The data will be exposed by ArrayAccessTrait to support accessing the class object like an array.
*
* @property array $data
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
trait ArrayAccessTrait
{
/**
* Returns an iterator for traversing the data.
* This method is required by the SPL interface [[\IteratorAggregate]].
* It will be implicitly called when you use `foreach` to traverse the collection.
* @return \ArrayIterator an iterator for traversing the cookies in the collection.
*/
public function getIterator()
{
return new \ArrayIterator($this->data);
}
/**
* Returns the number of data items.
* This method is required by Countable interface.
* @return int number of data elements.
*/
public function count()
{
return count($this->data);
}
/**
* This method is required by the interface [[\ArrayAccess]].
* @param mixed $offset the offset to check on
* @return bool
*/
public function offsetExists($offset)
{
return isset($this->data[$offset]);
}
/**
* This method is required by the interface [[\ArrayAccess]].
* @param int $offset the offset to retrieve element.
* @return mixed the element at the offset, null if no element is found at the offset
*/
public function offsetGet($offset)
{
return isset($this->data[$offset]) ? $this->data[$offset] : null;
}
/**
* This method is required by the interface [[\ArrayAccess]].
* @param int $offset the offset to set element
* @param mixed $item the element value
*/
public function offsetSet($offset, $item)
{
$this->data[$offset] = $item;
}
/**
* This method is required by the interface [[\ArrayAccess]].
* @param mixed $offset the offset to unset element
*/
public function offsetUnset($offset)
{
unset($this->data[$offset]);
}
}