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    <h3>Editing: SessionBagProxy.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpFoundation\Session;

/**
 * @author Nicolas Grekas &lt;p@tchwork.com&gt;
 *
 * @internal
 */
final class SessionBagProxy implements SessionBagInterface
{
    private $bag;
    private $data;
    private $usageIndex;
    private $usageReporter;

    public function __construct(SessionBagInterface $bag, array &amp;$data, ?int &amp;$usageIndex, ?callable $usageReporter)
    {
        $this-&gt;bag = $bag;
        $this-&gt;data = &amp;$data;
        $this-&gt;usageIndex = &amp;$usageIndex;
        $this-&gt;usageReporter = $usageReporter;
    }

    public function getBag(): SessionBagInterface
    {
        ++$this-&gt;usageIndex;
        if ($this-&gt;usageReporter &amp;&amp; 0 &lt;= $this-&gt;usageIndex) {
            ($this-&gt;usageReporter)();
        }

        return $this-&gt;bag;
    }

    public function isEmpty(): bool
    {
        if (!isset($this-&gt;data[$this-&gt;bag-&gt;getStorageKey()])) {
            return true;
        }
        ++$this-&gt;usageIndex;
        if ($this-&gt;usageReporter &amp;&amp; 0 &lt;= $this-&gt;usageIndex) {
            ($this-&gt;usageReporter)();
        }

        return empty($this-&gt;data[$this-&gt;bag-&gt;getStorageKey()]);
    }

    /**
     * {@inheritdoc}
     */
    public function getName(): string
    {
        return $this-&gt;bag-&gt;getName();
    }

    /**
     * {@inheritdoc}
     */
    public function initialize(array &amp;$array): void
    {
        ++$this-&gt;usageIndex;
        if ($this-&gt;usageReporter &amp;&amp; 0 &lt;= $this-&gt;usageIndex) {
            ($this-&gt;usageReporter)();
        }

        $this-&gt;data[$this-&gt;bag-&gt;getStorageKey()] = &amp;$array;

        $this-&gt;bag-&gt;initialize($array);
    }

    /**
     * {@inheritdoc}
     */
    public function getStorageKey(): string
    {
        return $this-&gt;bag-&gt;getStorageKey();
    }

    /**
     * {@inheritdoc}
     */
    public function clear()
    {
        return $this-&gt;bag-&gt;clear();
    }
}
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