Add PHPStan (#4021)

* Add PHPStan
#fix https://github.com/FreshRSS/FreshRSS/issues/4016
https://phpstan.org/

```sh
composer run-script phpstan
```

* More fixes

* Fix global variables

* Add .phtml

* Fix merge
https://github.com/FreshRSS/FreshRSS/pull/4090

* Fix more warnings

* Fix view errors and enable in CI

* ReturnTypeWillChange

* Dynamic view type

* Fix Minz static/self bug

1 files changed, 3 insertions, 3 deletions

diff --git a/app/Services/ExportService.php b/app/Services/ExportService.php
index 78ef45c4e..d8db4df71 100644
--- a/app/Services/ExportService.php
+++ b/app/Services/ExportService.php
@@ -41,7 +41,7 @@ class FreshRSS_Export_Service {
 	public function generateOpml() {
 		require_once(LIB_PATH . '/lib_opml.php');
 
-		$view = new Minz_View();
+		$view = new FreshRSS_View();
 		$day = date('Y-m-d');
 		$categories = [];
 
@@ -72,7 +72,7 @@ class FreshRSS_Export_Service {
 	 * @return array First item is the filename, second item is the content
 	 */
 	public function generateStarredEntries($type) {
-		$view = new Minz_View();
+		$view = new FreshRSS_View();
 		$view->categories = $this->category_dao->listCategories();
 		$day = date('Y-m-d');
 
@@ -108,7 +108,7 @@ class FreshRSS_Export_Service {
 			return null;
 		}
 
-		$view = new Minz_View();
+		$view = new FreshRSS_View();
 		$view->categories = $this->category_dao->listCategories();
 		$view->feed = $feed;
 		$day = date('Y-m-d');