The composer.lock file of your project should be up to date

More information: https://insight.symfony.com/what-we-analyse/composer.outdated_lock_file

in composer.lock
The lock file is not up to date with the latest changes in composer.json. You may be getting outdated dependencies. Run update to update them.
Time to fix: about 1 hour
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Your project must not contain invalid function or method calls

More information: https://insight.symfony.com/what-we-analyse/php.invalid_call

in src/Flash.php, line 86 
  1.      *
  2.      * @return mixed
  3.      */
  4.     protected static function invoke(string $method, array $arguments)
  5.     {
  6.         return call_user_func_array([self::$engine, $method], $arguments);
    Parameter #1 $function of function call_user_func_array expects callable(): mixed, array{Tamtamchik\SimpleFlash\Core\Engine, string} given.
    Time to fix: about 9 minutes
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                                    Last edited  by Yuri Tkachenko
                    
  7.     }
  9.     /**
  10.      * @throws FlashSingletonException
  11.      */

Your project should not use invalid parameter and return typehints 6

More information: https://insight.symfony.com/what-we-analyse/php.invalid_typehint

in src/Flash.php, line 69 
  1.      * @param string $method - method to invoke
  2.      * @param array $arguments - arguments for method
  3.      *
  4.      * @return mixed
  5.      */
  6.     public static function __callStatic(string $method, array $arguments)
    Method Tamtamchik\SimpleFlash\Flash::__callStatic() has parameter $arguments with no value type specified in iterable type array.
    Time to fix: about 9 minutes
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                                    Last edited  by Yuri Tkachenko
                    
  7.     {
  8.         new self();
  10.         return self::invoke($method, $arguments);
  11.     }
in src/Flash.php, line 84 
  1.      * @param string $method - method to invoke
  2.      * @param array $arguments - arguments for method
  3.      *
  4.      * @return mixed
  5.      */
  6.     protected static function invoke(string $method, array $arguments)
    Method Tamtamchik\SimpleFlash\Flash::invoke() has parameter $arguments with no value type specified in iterable type array.
    Time to fix: about 9 minutes
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                                    Last edited  by Yuri Tkachenko
                    
  7.     {
  8.         return call_user_func_array([self::$engine, $method], $arguments);
  9.     }
  11.     /**
in src/Flash.php, line 105 
  1.      * @param string $method - method to invoke
  2.      * @param array $arguments - arguments for method
  3.      *
  4.      * @return mixed
  5.      */
  6.     public function __call(string $method, array $arguments)
    Method Tamtamchik\SimpleFlash\Flash::__call() has parameter $arguments with no value type specified in iterable type array.
    Time to fix: about 9 minutes
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                                    Last edited  by Yuri Tkachenko
                    
  7.     {
  8.         return $this->invoke($method, $arguments);
  9.     }
  11.     /**
in src/Core/Engine.php, line 100 
  1.     /**
  2.      * @param array $session
  3.      * @param string|null $type
  4.      * @return bool
  5.      */
  6.     private function isReadyForDisplay(array $session, ?string $type = null): bool
    Method Tamtamchik\SimpleFlash\Core\Engine::isReadyForDisplay() has parameter $session with no value type specified in iterable type array.
    Time to fix: about 9 minutes
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                                    Last edited  by Yuri Tkachenko
                    
  7.     {
  8.         $isEmptySession = empty($session);
  9.         $isTypeNotInSession = ! is_null($type) && ! array_key_exists($type, $session);
  10.         $isTypeNotInTypes = ! is_null($type) && ! $this->hasMessageType($type);
in src/Core/MessageManager.php, line 61 
  1.      * @param array $flashes - array of messages to show
  2.      * @param string $type - message type: success, info, warning, error
  3.      *
  4.      * @return string - HTML with flash messages
  5.      */
  6.     protected function compileMessages(array $flashes, string $type): string
    Method Tamtamchik\SimpleFlash\Core\MessageManager::compileMessages() has parameter $flashes with no value type specified in iterable type array.
    Time to fix: about 9 minutes
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                                    Last edited  by Yuri Tkachenko
                    
  7.     {
  8.         $messages = '';
  9.         foreach ($flashes as $msg) {
  10.             $messages .= $this->template->getTemplate()->wrapMessage($msg);
  11.         }
in src/Core/SessionManager.php, line 24 
  1.     protected function getSession(): array
  2.     {
  3.         return $_SESSION[$this->key];
  4.     }
  6.     protected function setSession(array $session): void
    Method Tamtamchik\SimpleFlash\Core\SessionManager::setSession() has parameter $session with no value type specified in iterable type array.
    Time to fix: about 9 minutes
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                                    Last edited  by Yuri Tkachenko
                    
  7.     {
  8.         $_SESSION[$this->key] = $session;
  9.     }
  10. }

Your project should not use invalid return types

More information: https://insight.symfony.com/what-we-analyse/php.invalid_return_typehint

in src/TemplateFactory.php, line 25 
  1.     public static function create(string $name = Templates::BASE): TemplateInterface
  2.     {
  3.         $class = __NAMESPACE__ . '\\Templates\\' . ucwords($name) . 'Template';
  5.         if (class_exists($class)) {
  6.             return new $class();
    Method Tamtamchik\SimpleFlash\TemplateFactory::create() should return Tamtamchik\SimpleFlash\TemplateInterface but returns object.
    Time to fix: about 9 minutes
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                                    Last edited  by Yuri Tkachenko
                    
  7.         }
  9.         throw new FlashTemplateNotFoundException("Template \"{$name}\" not found!");
  10.     }
  11. }

Your project should use return types

More information: https://insight.symfony.com/what-we-analyse/php.missing_return_typehint

in src/Core/SessionManager.php, line 19 
  1.         if ( ! array_key_exists($this->key, $_SESSION)) {
  2.             $_SESSION[$this->key] = [];
  3.         }
  4.     }
  6.     protected function getSession(): array
    Method Tamtamchik\SimpleFlash\Core\SessionManager::getSession() return type has no value type specified in iterable type array.
    Time to fix: about 9 minutes
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                                    Last edited  by Yuri Tkachenko
                    
  7.     {
  8.         return $_SESSION[$this->key];
  9.     }
  11.     protected function setSession(array $session): void

Your project is using a unnecessary isset call

More information: https://insight.symfony.com/what-we-analyse/php.invalid_isset_use

in src/Flash.php, line 56 
  1.     {
  2.         if ($assigned = is_null($template)) {
  3.             $template = TemplateFactory::create();
  4.         }
  6.         if ( ! $assigned || ! isset(self::$engine)) {
    Static property Tamtamchik\SimpleFlash\Flash::$engine (Tamtamchik\SimpleFlash\Core\Engine) in isset() is not nullable.
    Time to fix: about 9 minutes
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                                    Last edited  by Yuri Tkachenko
                    
  7.             self::$engine = new Engine($template);
  8.         }
  9.     }
  11.     /**