PHP 7.4 compatibility fixes

Author: dg

src/Forms/Container.php

@@ -170,7 +170,7 @@ public function validate(array $controls = null): void
 			}
 			foreach ($this->onValidate as $handler) {
 				$params = Nette\Utils\Callback::toReflection($handler)->getParameters();
-				$values = isset($params[1]) ? $this->getValues((string) $params[1]->getType()) : null;
+				$values = isset($params[1]) ? $this->getValues($params[1]->getType() ? $params[1]->getType()->getName() : null) : null;
 				$handler($this, $values);
 			}
 		}

src/Forms/Controls/UploadControl.php

@@ -104,9 +104,9 @@ public function isOk(): bool
 	public function addRule($validator, $errorMessage = null, $arg = null)
 	{
 		if ($validator === Forms\Form::IMAGE) {
-			$this->control->accept = implode(FileUpload::IMAGE_MIME_TYPES, ', ');
+			$this->control->accept = implode(', ', FileUpload::IMAGE_MIME_TYPES);
 		} elseif ($validator === Forms\Form::MIME_TYPE) {
-			$this->control->accept = implode((array) $arg, ', ');
+			$this->control->accept = implode(', ', (array) $arg);
 		}
 		return parent::addRule($validator, $errorMessage, $arg);
 	}

src/Forms/Form.php

@@ -209,7 +209,7 @@ public function isMethod(string $method): bool
 	public function addProtection(string $errorMessage = null): Controls\CsrfProtection
 	{
 		$control = new Controls\CsrfProtection($errorMessage);
-		$this->addComponent($control, self::PROTECTOR_ID, key($this->getComponents()));
+		$this->addComponent($control, self::PROTECTOR_ID, key((array) $this->getComponents()));
 		return $control;
 	}
 
@@ -416,7 +416,7 @@ private function invokeHandlers(iterable $handlers, $button = null): void
 	{
 		foreach ($handlers as $handler) {
 			$params = Nette\Utils\Callback::toReflection($handler)->getParameters();
-			$values = isset($params[1]) ? $this->getValues((string) $params[1]->getType()) : null;
+			$values = isset($params[1]) ? $this->getValues($params[1]->getType() ? $params[1]->getType()->getName() : null) : null;
 			$handler($button ?: $this, $values);
 			if (!$this->isValid()) {
 				return;