init

vendor/yiisoft/yii2/base/ArrayAccessTrait.php

@@ -0,0 +1,82 @@
+<?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]);
+    }
+}