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