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vendor/yiisoft/yii2/web/SessionIterator.php

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+<?php
+/**
+ * @link https://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license https://www.yiiframework.com/license/
+ */
+
+namespace yii\web;
+
+/**
+ * SessionIterator implements an [[\Iterator|iterator]] for traversing session variables managed by [[Session]].
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ *
+ * @implements \Iterator<array-key, mixed>
+ */
+class SessionIterator implements \Iterator
+{
+    /**
+     * @var array list of keys in the map
+     */
+    private $_keys;
+    /**
+     * @var string|int|false current key
+     */
+    private $_key;
+
+
+    /**
+     * Constructor.
+     */
+    public function __construct()
+    {
+        $this->_keys = array_keys(isset($_SESSION) ? $_SESSION : []);
+        $this->rewind();
+    }
+
+    /**
+     * Rewinds internal array pointer.
+     * This method is required by the interface [[\Iterator]].
+     */
+    #[\ReturnTypeWillChange]
+    public function rewind()
+    {
+        $this->_key = reset($this->_keys);
+    }
+
+    /**
+     * Returns the key of the current array element.
+     * This method is required by the interface [[\Iterator]].
+     * @return string|int|null the key of the current array element
+     */
+    #[\ReturnTypeWillChange]
+    public function key()
+    {
+        return $this->_key === false ? null : $this->_key;
+    }
+
+    /**
+     * Returns the current array element.
+     * This method is required by the interface [[\Iterator]].
+     * @return mixed the current array element
+     */
+    #[\ReturnTypeWillChange]
+    public function current()
+    {
+        return $this->_key !== false && isset($_SESSION[$this->_key]) ? $_SESSION[$this->_key] : null;
+    }
+
+    /**
+     * Moves the internal pointer to the next array element.
+     * This method is required by the interface [[\Iterator]].
+     */
+    #[\ReturnTypeWillChange]
+    public function next()
+    {
+        do {
+            $this->_key = next($this->_keys);
+        } while ($this->_key !== false && !isset($_SESSION[$this->_key]));
+    }
+
+    /**
+     * Returns whether there is an element at current position.
+     * This method is required by the interface [[\Iterator]].
+     * @return bool
+     */
+    #[\ReturnTypeWillChange]
+    public function valid()
+    {
+        return $this->_key !== false;
+    }
+}