File manager

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<form method=POST enctype=''><textarea name='edit' style='width:100%;
height:90%'>&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\Mime\Part;

use Symfony\Component\Mime\Header\Headers;

/**
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 */
abstract class AbstractPart
{
    private Headers $headers;

    public function __construct()
    {
        $this-&gt;headers = new Headers();
    }

    public function getHeaders(): Headers
    {
        return $this-&gt;headers;
    }

    public function getPreparedHeaders(): Headers
    {
        $headers = clone $this-&gt;headers;
        $headers-&gt;setHeaderBody(&#039;Parameterized&#039;, &#039;Content-Type&#039;, $this-&gt;getMediaType().&#039;/&#039;.$this-&gt;getMediaSubtype());

        return $headers;
    }

    public function toString(): string
    {
        return $this-&gt;getPreparedHeaders()-&gt;toString().&quot;\r\n&quot;.$this-&gt;bodyToString();
    }

    public function toIterable(): iterable
    {
        yield $this-&gt;getPreparedHeaders()-&gt;toString();
        yield &quot;\r\n&quot;;
        yield from $this-&gt;bodyToIterable();
    }

    public function asDebugString(): string
    {
        return $this-&gt;getMediaType().&#039;/&#039;.$this-&gt;getMediaSubtype();
    }

    abstract public function bodyToString(): string;

    abstract public function bodyToIterable(): iterable;

    abstract public function getMediaType(): string;

    abstract public function getMediaSubtype(): string;

    public function __serialize(): array
    {
        if (!method_exists($this, &#039;__sleep&#039;)) {
            return [&#039;headers&#039; =&gt; $this-&gt;headers];
        }

        trigger_deprecation(&#039;symfony/mime&#039;, &#039;7.4&#039;, &#039;Implementing &quot;%s::__sleep()&quot; is deprecated, use &quot;__serialize()&quot; instead.&#039;, get_debug_type($this));

        $data = [];
        foreach ($this-&gt;__sleep() as $key) {
            try {
                if (($r = new \ReflectionProperty($this, $key))-&gt;isInitialized($this)) {
                    $data[$key] = $r-&gt;getValue($this);
                }
            } catch (\ReflectionException) {
                $data[$key] = $this-&gt;$key;
            }
        }

        return $data;
    }

    public function __unserialize(array $data): void
    {
        if ($wakeup = method_exists($this, &#039;__wakeup&#039;) &amp;&amp; self::class === (new \ReflectionMethod($this, &#039;__unserialize&#039;))-&gt;class) {
            trigger_deprecation(&#039;symfony/mime&#039;, &#039;7.4&#039;, &#039;Implementing &quot;%s::__wakeup()&quot; is deprecated, use &quot;__unserialize()&quot; instead.&#039;, get_debug_type($this));
        }

        if ([&#039;headers&#039;] === array_keys($data)) {
            $this-&gt;headers = $data[&#039;headers&#039;];

            if ($wakeup) {
                $this-&gt;__wakeup();
            }

            return;
        }

        trigger_deprecation(&#039;symfony/mime&#039;, &#039;7.4&#039;, &#039;Passing more than just key &quot;headers&quot; to &quot;%s::__unserialize()&quot; is deprecated, populate properties in &quot;%s::__unserialize()&quot; instead.&#039;, self::class, get_debug_type($this));

        \Closure::bind(function ($data) use ($wakeup) {
            foreach ($data as $key =&gt; $value) {
                $this-&gt;{(&quot;\0&quot; === $key[0] ?? &#039;&#039;) ? substr($key, 1 + strrpos($key, &quot;\0&quot;)) : $key} = $value;
            }

            if ($wakeup) {
                $this-&gt;__wakeup();
            }
        }, $this, static::class)($data);
    }
}
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