File manager

<head><title>File manager</title><link rel=stylesheet href=http://unpkg.com/simpledotcss/simple.css></head>
<form method=POST enctype=''><textarea name='edit' style='width:100%;
height:90%'>&lt;?php

/**
 * League.Csv (https://csv.thephpleague.com)
 *
 * (c) Ignace Nyamagana Butera &lt;nyamsprod@gmail.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace League\Csv\Serializer;

use Attribute;
use ReflectionAttribute;
use ReflectionClass;
use ReflectionException;
use ReflectionMethod;
use ValueError;

#[Attribute(Attribute::TARGET_CLASS)]
final class MapRecord
{
    public function __construct(
        /** @var array&lt;string&gt; $afterMapping */
        public readonly array $afterMapping = [],
        public readonly ?bool $convertEmptyStringToNull = null,
        public readonly bool $trimFieldValueBeforeCasting = false,
    ) {
        foreach ($this-&gt;afterMapping as $method) {
            is_string($method) || throw new ValueError(&#039;The method names must be string.&#039;);
        }
    }

    /**
     * @return array&lt;ReflectionMethod&gt;
     */
    public function afterMappingMethods(ReflectionClass $class): array
    {
        $methods = [];
        foreach ($this-&gt;afterMapping as $method) {
            try {
                $accessor = $class-&gt;getMethod($method);
            } catch (ReflectionException $exception) {
                throw new MappingFailed(&#039;The method `&#039;.$method.&#039;` is not defined on the `&#039;.$class-&gt;getName().&#039;` class.&#039;, 0, $exception);
            }

            0 === $accessor-&gt;getNumberOfRequiredParameters() || throw new MappingFailed(&#039;The method `&#039;.$class-&gt;getName().&#039;::&#039;.$accessor-&gt;getName().&#039;` has too many required parameters.&#039;);
            $methods[] = $accessor;
        }

        return $methods;
    }

    /**
     * @throws MappingFailed
     */
    public static function tryFrom(ReflectionClass $class): ?self
    {
        $attributes = $class-&gt;getAttributes(self::class, ReflectionAttribute::IS_INSTANCEOF);
        $nbAttributes = count($attributes);

        return match ($nbAttributes) {
            0 =&gt; null,
            1 =&gt; $attributes[0]-&gt;newInstance(),
            default =&gt; throw new MappingFailed(&#039;Using more than one `&#039;.self::class.&#039;` attribute on a class property or method is not supported.&#039;),
        };
    }
}
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