Add support for extension priority (#8038)

Extension can now define their hook priority. This will allow to define the order in which hooks are triggered.

See #7110

Closes #7110

Changes proposed in this pull request:

- Add support for extension priority

How to test the feature manually:

1. Create an extension with 2 hooks on the same hook type but different priority
2. The hooks must be prepending the title with different values
3. Validate that changing the hook priority changes the final title accordingly.

1 files changed, 5 insertions, 2 deletions

diff --git a/docs/fr/developers/03_Backend/05_Extensions.md b/docs/fr/developers/03_Backend/05_Extensions.md
index 00a229e94..f790db5f4 100644
--- a/docs/fr/developers/03_Backend/05_Extensions.md
+++ b/docs/fr/developers/03_Backend/05_Extensions.md
@@ -189,6 +189,9 @@ Your class will benefit from four methods to redefine:
 
 You can register at the FreshRSS event system in an extensions `init()`
 method, to manipulate data when some of the core functions are executed.
+Le dernier paramètre représente la priorité du *hook* quand celui-ci est déclenché.
+Le *hook* avec la priorité la plus basse sera déclenché en premier.
+La priorité par défaut est 0.
 
 ```php
 final class HelloWorldExtension extends Minz_Extension
@@ -197,8 +200,8 @@ final class HelloWorldExtension extends Minz_Extension
 	public function init(): void {
 		parent::init();
 
-		$this->registerHook(Minz_HookType::EntryBeforeDisplay, [$this, 'renderEntry']);
-		$this->registerHook(Minz_HookType::CheckUrlBeforeAdd, [self::class, 'checkUrl']);
+		$this->registerHook(Minz_HookType::EntryBeforeDisplay, [$this, 'renderEntry'], 10);
+		$this->registerHook(Minz_HookType::CheckUrlBeforeAdd, [self::class, 'checkUrl'], -10);
 	}
 
 	public function renderEntry(FreshRSS_Entry $entry): FreshRSS_Entry {