vendor/league/flysystem/src/Adapter/NullAdapter.php

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<?php

namespace League\Flysystem\Adapter;

use League\Flysystem\Adapter\Polyfill\StreamedCopyTrait;
use League\Flysystem\Adapter\Polyfill\StreamedTrait;
use League\Flysystem\Config;

class NullAdapter extends AbstractAdapter
{
    use StreamedTrait;
    use StreamedCopyTrait;

    /**
     * Check whether a file is present.
     *
     * @param string $path
     *
     * @return bool
     */
    public function has($path)
    {
        return false;
    }

    /**
     * @inheritdoc
     */
    public function write($path, $contents, Config $config)
    {
        $type = 'file';
        $result = compact('contents', 'type', 'path');

        if ($visibility = $config->get('visibility')) {
            $result['visibility'] = $visibility;
        }

        return $result;
    }

    /**
     * @inheritdoc
     */
    public function update($path, $contents, Config $config)
    {
        return false;
    }

    /**
     * @inheritdoc
     */
    public function read($path)
    {
        return false;
    }

    /**
     * @inheritdoc
     */
    public function rename($path, $newpath)