PHPStan level 6 for all PDO and Exception classes (#5239)

* PHPStan level 6 for all PDO and Exception classes
Contributes to https://github.com/FreshRSS/FreshRSS/issues/4112

* Fix type

* Now also our remaining own librairies

* Motivation for a few more files

* A few more DAO classes

* Last interface

1 files changed, 4 insertions, 2 deletions

diff --git a/app/Exceptions/FeedNotAddedException.php b/app/Exceptions/FeedNotAddedException.php
index 59fa74b16..b10e93f05 100644
--- a/app/Exceptions/FeedNotAddedException.php
+++ b/app/Exceptions/FeedNotAddedException.php
@@ -1,14 +1,16 @@
 <?php
 
 class FreshRSS_FeedNotAdded_Exception extends Exception {
+
+	/** @var string */
 	private $url = '';
 
-	public function __construct($url) {
+	public function __construct(string $url) {
 		parent::__construct('Feed not added! ' . $url, 2147);
 		$this->url = $url;
 	}
 
-	public function url() {
+	public function url(): string {
 		return $this->url;
 	}
 }