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 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 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 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/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. }
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/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);

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 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.     /**