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, 3 insertions, 10 deletions

diff --git a/cli/i18n/I18nValidatorInterface.php b/cli/i18n/I18nValidatorInterface.php
index d5681912b..e6f5f7cdd 100644
--- a/cli/i18n/I18nValidatorInterface.php
+++ b/cli/i18n/I18nValidatorInterface.php
@@ -5,21 +5,14 @@ interface I18nValidatorInterface {
 	/**
 	 * Display the validation result.
 	 * Empty if there are no errors.
-	 *
-	 * @return array
 	 */
-	public function displayResult();
+	public function displayResult(): string;
 
-	/**
-	 * @return bool
-	 */
-	public function validate();
+	public function validate(): bool;
 
 	/**
 	 * Display the validation report.
-	 *
-	 * @return string
 	 */
-	public function displayReport();
+	public function displayReport(): string;
 
 }