vendor/league/flysystem/src/Config.php

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<?php

namespace League\Flysystem;

class Config
{
    /**
     * @var array
     */
    protected $settings = [];

    /**
     * @var Config|null
     */
    protected $fallback;

    /**
     * Constructor.
     *
     * @param array $settings
     */
    public function __construct(array $settings = [])
    {
        $this->settings = $settings;
    }

    /**
     * Get a setting.
     *
     * @param string $key
     * @param mixed  $default
     *
     * @return mixed config setting or default when not found
     */
    public function get($key, $default = null)
    {
        if ( ! array_key_exists($key, $this->settings)) {
            return $this->getDefault($key, $default);
        }

        return $this->settings[$key];
    }

    /**
     * Check if an item exists by key.
     *
     * @param string $key
     *
     * @return bool
     */
    public function has($key)
    {
        if (array_key_exists($key, $this->settings)) {
            return true;
        }

        return $this->fallback instanceof Config
            ? $this->fallback->has($key)
            : false;
    }