vendor/illuminate/support/MessageBag.php

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<?php

namespace Illuminate\Support;

use Countable;
use JsonSerializable;
use Illuminate\Contracts\Support\Jsonable;
use Illuminate\Contracts\Support\Arrayable;
use Illuminate\Contracts\Support\MessageProvider;
use Illuminate\Contracts\Support\MessageBag as MessageBagContract;

class MessageBag implements Arrayable, Countable, Jsonable, JsonSerializable, MessageBagContract, MessageProvider
{
    /**
     * All of the registered messages.
     *
     * @var array
     */
    protected $messages = [];

    /**
     * Default format for message output.
     *
     * @var string
     */
    protected $format = ':message';

    /**
     * Create a new message bag instance.
     *
     * @param  array  $messages
     * @return void
     */
    public function __construct(array $messages = [])
    {
        foreach ($messages as $key => $value) {
            $value = $value instanceof Arrayable ? $value->toArray() : (array) $value;

            $this->messages[$key] = array_unique($value);
        }
    }

    /**
     * Get the keys present in the message bag.
     *
     * @return array
     */
    public function keys()
    {
        return array_keys($this->messages);
    }

    /**
     * Add a message to the message bag.
     *
     * @param  string  $key
     * @param  string  $message
     * @return $this
     */
    public function add($key, $message)