vendor/illuminate/support/Optional.php

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<?php

namespace Illuminate\Support;

use ArrayAccess;
use ArrayObject;

class Optional implements ArrayAccess
{
    use Traits\Macroable {
        __call as macroCall;
    }

    /**
     * The underlying object.
     *
     * @var mixed
     */
    protected $value;

    /**
     * Create a new optional instance.
     *
     * @param  mixed  $value
     * @return void
     */
    public function __construct($value)
    {
        $this->value = $value;
    }

    /**
     * Dynamically access a property on the underlying object.
     *
     * @param  string  $key
     * @return mixed
     */
    public function __get($key)
    {
        if (is_object($this->value)) {
            return $this->value->{$key} ?? null;
        }
    }

    /**
     * Dynamically check a property exists on the underlying object.
     *
     * @param  mixed  $name
     * @return bool
     */
    public function __isset($name)
    {
        if (is_object($this->value)) {
            return isset($this->value->{$name});
        }

        if (is_array($this->value) || $this->value instanceof ArrayObject) {
            return isset($this->value[$name]);
        }