Very simple flash messinging system

flash.php

<?php

namespace App\Http;

use Illuminate\Session\SessionInterface;
use InvalidArgumentException;

class Flash
{
    protected $session;

    protected static $allowedFunctions = [
        'success',
        'info',
        'warning',
        'error'
    ];

    public function __construct(SessionInterface $session)
    {
        $this->session = $session;
    }

    public function __call($name, $arguments)
    {
        if(count($arguments) === 0) {
            throw new InvalidArgumentException;
        }

        if(! in_array($name, static::$allowedFunctions)) {
            throw new \Exception("The [{$name}] type is not allowed");
        }

        return $this->create($arguments[0], $arguments[1], $name);
    }

    public function overlay($title, $message, $level = 'info')
    {
        return $this->create($title, $message, $level, 'flash_message_overlay');
    }

    protected function create($title, $message, $level, $key = 'flash_message')
    {
        return $this->session->flash($key, [
            'level' => $level,
            'title' => $title,
            'message' => $message
        ]);
    }
}

helpers.php

<?php

function flash($title = null, $message = null)
{
    $flash = app('flash');

    if(func_num_args() === 0) {
        return $flash;
    }

    return $flash->info($title, $message);
}